189439919460 has 72 divisors (see below), whose sum is σ = 626873921856. Its totient is φ = 45924828480.

The previous prime is 189439919411. The next prime is 189439919483. The reversal of 189439919460 is 64919934981.

189439919460 is a `hidden beast` number, since 1 + 8 + 9 + 439 + 9 + 194 + 6 + 0 = 666.

It is a super-2 number, since 2×189439919460² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47836384 + ... + 47840343.

It is an arithmetic number, because the mean of its divisors is an integer number (8706582248).

Almost surely, 2^189439919460 is an apocalyptic number.

189439919460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189439919460 is an abundant number, since it is smaller than the sum of its proper divisors (437434002396).

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

189439919460 is a wasteful number, since it uses less digits than its factorization.

189439919460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95676753 (or 95676748 counting only the distinct ones).

The product of its (nonzero) digits is 15116544, while the sum is 63.

The spelling of 189439919460 in words is "one hundred eighty-nine billion, four hundred thirty-nine million, nine hundred nineteen thousand, four hundred sixty".