138239900 has 36 divisors (see below), whose sum is σ = 305652312. Its totient is φ = 54250560.

The previous prime is 138239887. The next prime is 138239921. The reversal of 138239900 is 9932831.

138239900 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×138239900² = 38220539904020000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7742 + ... + 18341.

It is an arithmetic number, because the mean of its divisors is an integer number (8490342).

Almost surely, 2^138239900 is an apocalyptic number.

138239900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138239900 is an abundant number, since it is smaller than the sum of its proper divisors (167412412).

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

138239900 is a wasteful number, since it uses less digits than its factorization.

138239900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26150 (or 26143 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 138239900 is about 11757.5465127721. The cubic root of 138239900 is about 517.0642009297.

The spelling of 138239900 in words is "one hundred thirty-eight million, two hundred thirty-nine thousand, nine hundred".