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<S>                                                           <C>
 
PROSPECTUS SUPPLEMENT                                            FILE NO. 333-59997
(TO PROSPECTUS AND PROSPECTUS SUPPLEMENT DATED JULY 30, 1998)        RULE 424(B)(3)
PROSPECTUS NUMBER: 1820
 
 
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                           MERRILL LYNCH & CO., INC.
                          MEDIUM-TERM NOTES, SERIES B
                   DUE NINE MONTHS OR MORE FROM DATE OF ISSUE
                              FLOATING RATE NOTES
 
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<S>                     <C>               <C>                                 <C>
 
PRINCIPAL AMOUNT:       $95,000,000            ORIGINAL ISSUE DATE:           January 14, 1999
 
 
CUSIP NUMBER:           59018S W75             STATED MATURITY DATE:          February 10, 2000
 
 
INTEREST CALCULATION:                          DAY COUNT CONVENTION:
/x/ REGULAR FLOATING RATE NOTE                 /x/ ACTUAL/360
/ / INVERSE FLOATING RATE NOTE                 / / 30/360
(FIXED INTEREST RATE):                         / / ACTUAL/ACTUAL
 
 
INTEREST RATE BASIS:
/x/ LIBOR                                      / / COMMERCIAL PAPER RATE
/ / CMT RATE                                   / / ELEVENTH DISTRICT COST OF FUNDS RATE
/ / PRIME RATE                                 / / CD RATE
/ / FEDERAL FUNDS RATE                         / / OTHER (SEE ATTACHED)
/ / TREASURY RATE
DESIGNATED CMT PAGE:                           DESIGNATED LIBOR PAGE: 3750
CMT TELERATE PAGE:                             LIBOR TELERATE PAGE:
CMT REUTERS PAGE:                              LIBOR REUTERS PAGE:
 
 
INDEX MATURITY:         One Month              MINIMUM INTEREST RATE:         Not Applicable
 
 
SPREAD:                 0.010%                 MAXIMUM INTEREST RATE:         Not Applicable
 
 
INITIAL INTEREST RATE:  5.0125%                SPREAD MULTIPLIER:             Not Applicable
 
 
INTEREST RESET DATES:   Monthly, on the 10th, commencing February 10, 1999 to maturity; subject to
                        modified following business day convention.
 
 
INTEREST PAYMENT DATES: Monthly, on the 10th, commencing February 10, 1999 to maturity; subject to
                        modified following business day convention.
 
 
REPAYMENT AT THE
OPTION OF THE HOLDER:   The Notes cannot be repaid prior to the Stated Maturity Date.
 
 
REDEMPTION AT THE
OPTION OF THE COMPANY:  The Notes cannot be redeemed prior to the Stated Maturity Date.
 
 
FORM:                   The Notes are being issued in fully registered book-entry form.
 
 
TRUSTEE:                The Chase Manhattan Bank
 
 
DATED:                  January 11, 1999
 
 
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