138956015 has 8 divisors (see below), whose sum is σ = 181906128. Its totient is φ = 101058880.

The previous prime is 138955969. The next prime is 138956029. The reversal of 138956015 is 510659831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138956015 - 2⁶ = 138955951 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138956015.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1263182 + ... + 1263291.

It is an arithmetic number, because the mean of its divisors is an integer number (22738266).

Almost surely, 2^138956015 is an apocalyptic number.

138956015 is a deficient number, since it is larger than the sum of its proper divisors (42950113).

138956015 is a wasteful number, since it uses less digits than its factorization.

138956015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2526489.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 138956015 is about 11787.9605954550. The cubic root of 138956015 is about 517.9555014621.

The spelling of 138956015 in words is "one hundred thirty-eight million, nine hundred fifty-six thousand, fifteen".