188890120 has 32 divisors (see below), whose sum is σ = 428117400. Its totient is φ = 75002368.

The previous prime is 188890109. The next prime is 188890123. The reversal of 188890120 is 21098881.

It can be written as a sum of positive squares in 4 ways, for example, as 164506276 + 24383844 = 12826^2 + 4938^2 .

It is a super-2 number, since 2×188890120² = 71358954867228800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 188890120.

It is not an unprimeable number, because it can be changed into a prime (188890123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11755 + ... + 22714.

Almost surely, 2^188890120 is an apocalyptic number.

188890120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

188890120 is an abundant number, since it is smaller than the sum of its proper divisors (239227280).

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

188890120 is a wasteful number, since it uses less digits than its factorization.

188890120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34617 (or 34613 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 188890120 is about 13743.7302068980. The cubic root of 188890120 is about 573.7681201094.

The spelling of 188890120 in words is "one hundred eighty-eight million, eight hundred ninety thousand, one hundred twenty".