189988964 has 24 divisors (see below), whose sum is σ = 371144928. Its totient is φ = 84349440.

The previous prime is 189988951. The next prime is 189988973. The reversal of 189988964 is 469889981.

It is a junction number, because it is equal to n+sod(n) for n = 189988897 and 189988906.

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, 48317 + ... + 52100.

It is an arithmetic number, because the mean of its divisors is an integer number (15464372).

Almost surely, 2^189988964 is an apocalyptic number.

It is an amenable number.

189988964 is a deficient number, since it is larger than the sum of its proper divisors (181155964).

189988964 is a wasteful number, since it uses less digits than its factorization.

189988964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100475 (or 100473 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 62.

The square root of 189988964 is about 13783.6484284822. The cubic root of 189988964 is about 574.8785770074.

The spelling of 189988964 in words is "one hundred eighty-nine million, nine hundred eighty-eight thousand, nine hundred sixty-four".