188020138 has 16 divisors (see below), whose sum is σ = 287400960. Its totient is φ = 92226496.

The previous prime is 188020127. The next prime is 188020159. The reversal of 188020138 is 831020881.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68631 + ... + 71317.

It is an arithmetic number, because the mean of its divisors is an integer number (17962560).

Almost surely, 2^188020138 is an apocalyptic number.

188020138 is a deficient number, since it is larger than the sum of its proper divisors (99380822).

188020138 is a wasteful number, since it uses less digits than its factorization.

188020138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3341.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 188020138 is about 13712.0435384373. The cubic root of 188020138 is about 572.8858854142.

The spelling of 188020138 in words is "one hundred eighty-eight million, twenty thousand, one hundred thirty-eight".