138018916 has 24 divisors (see below), whose sum is σ = 276554880. Its totient is φ = 59040192.

The previous prime is 138018899. The next prime is 138018919. The reversal of 138018916 is 619810831.

It is not an unprimeable number, because it can be changed into a prime (138018919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11601 + ... + 20263.

It is an arithmetic number, because the mean of its divisors is an integer number (11523120).

Almost surely, 2^138018916 is an apocalyptic number.

It is an amenable number.

138018916 is an abundant number, since it is smaller than the sum of its proper divisors (138535964).

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

138018916 is a wasteful number, since it uses less digits than its factorization.

138018916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9243 (or 9241 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 138018916 is about 11748.1452153095. The cubic root of 138018916 is about 516.7885355714.

The spelling of 138018916 in words is "one hundred thirty-eight million, eighteen thousand, nine hundred sixteen".