FILE NO. 333-59997
                                                                  RULE 424(B)(3)
 
                             PROSPECTUS SUPPLEMENT
(TO PROSPECTUS DATED JULY 30, 1998 AND PROSPECTUS SUPPLEMENT DATED FEBRUARY 17,
                                     1999)
                                     PROSPECTUS NUMBER: 1865
 
 
                           MERRILL LYNCH & CO., INC.
                          MEDIUM-TERM NOTES, SERIES B
                   DUE NINE MONTHS OR MORE FROM DATE OF ISSUE
 
                                FIXED RATE NOTES
 
<TABLE>
<CAPTION>
 
<S>                      <C>
 
PRINCIPAL AMOUNT:        $100,000,000
 
 
CUSIP NUMBER:            59018S 2U7
 
 
INTEREST RATE:           5.72000%
 
 
ORIGINAL ISSUE DATE:     April 30, 1999
 
 
STATED MATURITY DATE:    April 15, 2002
 
 
INTEREST PAYMENT DATES:  Each April 15th and October 15th, commencing on October 15, 1999, 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:                   April 27, 1999
 
 
</TABLE>