188911980 has 48 divisors (see below), whose sum is σ = 587727840. Its totient is φ = 50376384.

The previous prime is 188911979. The next prime is 188911999. The reversal of 188911980 is 89119881.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174379 + ... + 175458.

It is an arithmetic number, because the mean of its divisors is an integer number (12244330).

Almost surely, 2^188911980 is an apocalyptic number.

188911980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

188911980 is an abundant number, since it is smaller than the sum of its proper divisors (398815860).

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

188911980 is a wasteful number, since it uses less digits than its factorization.

188911980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349855 (or 349847 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 45.

The square root of 188911980 is about 13744.5254556132. The cubic root of 188911980 is about 573.7902530604.

The spelling of 188911980 in words is "one hundred eighty-eight million, nine hundred eleven thousand, nine hundred eighty".