188399402500 has 45 divisors (see below), whose sum is σ = 412039277881. Its totient is φ = 75351080000.

The previous prime is 188399402497. The next prime is 188399402531. The reversal of 188399402500 is 5204993881.

The square root of 188399402500 is 434050.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 81255782916 + 107143619584 = 285054^2 + 327328^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 21698160 + ... + 21706840.

Almost surely, 2^188399402500 is an apocalyptic number.

188399402500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

188399402500 is the 434050-th square number.

It is an amenable number.

188399402500 is an abundant number, since it is smaller than the sum of its proper divisors (223639875381).

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

188399402500 is an frugal number, since it uses more digits than its factorization.

188399402500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17386 (or 8688 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 49.

Multiplying 188399402500 by its sum of digits (49), we get a square (9231570722500 = 3038350²).

The spelling of 188399402500 in words is "one hundred eighty-eight billion, three hundred ninety-nine million, four hundred two thousand, five hundred".