189686731998 has 16 divisors (see below), whose sum is σ = 382730752656. Its totient is φ = 62669362560.

The previous prime is 189686731981. The next prime is 189686732041. The reversal of 189686731998 is 899137686981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139886293 + ... + 139887648.

It is an arithmetic number, because the mean of its divisors is an integer number (23920672041).

Almost surely, 2^189686731998 is an apocalyptic number.

189686731998 is an abundant number, since it is smaller than the sum of its proper divisors (193044020658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189686731998 is a wasteful number, since it uses less digits than its factorization.

189686731998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279774059.

The product of its digits is 282175488, while the sum is 75.

The spelling of 189686731998 in words is "one hundred eighty-nine billion, six hundred eighty-six million, seven hundred thirty-one thousand, nine hundred ninety-eight".