189312388 has 6 divisors (see below), whose sum is σ = 331296686. Its totient is φ = 94656192.

The previous prime is 189312367. The next prime is 189312401. The reversal of 189312388 is 883213981.

189312388 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 147088384 + 42224004 = 12128^2 + 6498^2 .

189312388 is strictly pandigital in base 9.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23664045 + ... + 23664052.

Almost surely, 2^189312388 is an apocalyptic number.

It is an amenable number.

189312388 is a deficient number, since it is larger than the sum of its proper divisors (141984298).

189312388 is a wasteful number, since it uses less digits than its factorization.

189312388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47328101 (or 47328099 counting only the distinct ones).

The product of its digits is 82944, while the sum is 43.

The square root of 189312388 is about 13759.0838357792. The cubic root of 189312388 is about 574.1953589662.

The spelling of 189312388 in words is "one hundred eighty-nine million, three hundred twelve thousand, three hundred eighty-eight".