188494920 has 48 divisors (see below), whose sum is σ = 612609660. Its totient is φ = 50265216.

The previous prime is 188494907. The next prime is 188494921. The reversal of 188494920 is 29494881.

It can be written as a sum of positive squares in 2 ways, for example, as 169676676 + 18818244 = 13026^2 + 4338^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (188494921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 261439 + ... + 262158.

Almost surely, 2^188494920 is an apocalyptic number.

188494920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

188494920 is an abundant number, since it is smaller than the sum of its proper divisors (424114740).

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

188494920 is a wasteful number, since it uses less digits than its factorization.

188494920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523614 (or 523607 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 188494920 is about 13729.3452138112. The cubic root of 188494920 is about 573.3676906879.

The spelling of 188494920 in words is "one hundred eighty-eight million, four hundred ninety-four thousand, nine hundred twenty".