138942015 has 16 divisors (see below), whose sum is σ = 223675008. Its totient is φ = 73646496.

The previous prime is 138941983. The next prime is 138942019. The reversal of 138942015 is 510249831.

It is not a de Polignac number, because 138942015 - 2⁵ = 138941983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138942019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25969 + ... + 30858.

It is an arithmetic number, because the mean of its divisors is an integer number (13979688).

Almost surely, 2^138942015 is an apocalyptic number.

138942015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138942015 is a deficient number, since it is larger than the sum of its proper divisors (84732993).

138942015 is a wasteful number, since it uses less digits than its factorization.

138942015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56998.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 138942015 is about 11787.3667542840. The cubic root of 138942015 is about 517.9381059802.

The spelling of 138942015 in words is "one hundred thirty-eight million, nine hundred forty-two thousand, fifteen".