188086990 has 48 divisors (see below), whose sum is σ = 424140192. Its totient is φ = 59524416.

The previous prime is 188086981. The next prime is 188086991. The reversal of 188086990 is 99680881.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188086991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8394 + ... + 21133.

It is an arithmetic number, because the mean of its divisors is an integer number (8836254).

Almost surely, 2^188086990 is an apocalyptic number.

188086990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

188086990 is an abundant number, since it is smaller than the sum of its proper divisors (236053202).

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

188086990 is a wasteful number, since it uses less digits than its factorization.

188086990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29561 (or 29554 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 49.

The square root of 188086990 is about 13714.4810328353. The cubic root of 188086990 is about 572.9537753565.

The spelling of 188086990 in words is "one hundred eighty-eight million, eighty-six thousand, nine hundred ninety".