188538690 has 32 divisors (see below), whose sum is σ = 453418560. Its totient is φ = 50174144.

The previous prime is 188538673. The next prime is 188538697. The reversal of 188538690 is 96835881.

It is a super-2 number, since 2×188538690² = 71093675253832200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (188538697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9097 + ... + 21443.

It is an arithmetic number, because the mean of its divisors is an integer number (14169330).

Almost surely, 2^188538690 is an apocalyptic number.

188538690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

188538690 is an abundant number, since it is smaller than the sum of its proper divisors (264879870).

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

188538690 is a wasteful number, since it uses less digits than its factorization.

188538690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12866.

The product of its (nonzero) digits is 414720, while the sum is 48.

The square root of 188538690 is about 13730.9391521483. The cubic root of 188538690 is about 573.4120674127.

The spelling of 188538690 in words is "one hundred eighty-eight million, five hundred thirty-eight thousand, six hundred ninety".