138158916 has 48 divisors (see below), whose sum is σ = 375387264. Its totient is φ = 38727936.

The previous prime is 138158873. The next prime is 138158939. The reversal of 138158916 is 619851831.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 11065 + ... + 19968.

It is an arithmetic number, because the mean of its divisors is an integer number (7820568).

Almost surely, 2^138158916 is an apocalyptic number.

It is an amenable number.

138158916 is an abundant number, since it is smaller than the sum of its proper divisors (237228348).

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

138158916 is a wasteful number, since it uses less digits than its factorization.

138158916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31100 (or 31098 counting only the distinct ones).

The product of its digits is 51840, while the sum is 42.

The square root of 138158916 is about 11754.1020924612. The cubic root of 138158916 is about 516.9632119803.

The spelling of 138158916 in words is "one hundred thirty-eight million, one hundred fifty-eight thousand, nine hundred sixteen".