188172940 has 12 divisors (see below), whose sum is σ = 395163216. Its totient is φ = 75269168.

The previous prime is 188172937. The next prime is 188172953. The reversal of 188172940 is 49271881.

It is a happy number.

188172940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 188172893 and 188172902.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4704304 + ... + 4704343.

It is an arithmetic number, because the mean of its divisors is an integer number (32930268).

Almost surely, 2^188172940 is an apocalyptic number.

188172940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

188172940 is an abundant number, since it is smaller than the sum of its proper divisors (206990276).

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

188172940 is a wasteful number, since it uses less digits than its factorization.

188172940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9408656 (or 9408654 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 188172940 is about 13717.6142240551. The cubic root of 188172940 is about 573.0410361814.

The spelling of 188172940 in words is "one hundred eighty-eight million, one hundred seventy-two thousand, nine hundred forty".