138518720 has 56 divisors (see below), whose sum is σ = 349264224. Its totient is φ = 52146176.

The previous prime is 138518717. The next prime is 138518747. The reversal of 138518720 is 27815831.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7292 + ... + 18171.

Almost surely, 2^138518720 is an apocalyptic number.

138518720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138518720 is an abundant number, since it is smaller than the sum of its proper divisors (210745504).

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

138518720 is a wasteful number, since it uses less digits than its factorization.

138518720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25497 (or 25487 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 138518720 is about 11769.3976056551. The cubic root of 138518720 is about 517.4115946598.

The spelling of 138518720 in words is "one hundred thirty-eight million, five hundred eighteen thousand, seven hundred twenty".