139638015 has 24 divisors (see below), whose sum is σ = 264043728. Its totient is φ = 67703040.

The previous prime is 139638007. The next prime is 139638019. The reversal of 139638015 is 510836931.

It is a happy number.

139638015 is a `hidden beast` number, since 1 + 3 + 9 + 638 + 0 + 15 = 666.

It is not a de Polignac number, because 139638015 - 2³ = 139638007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139638019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 140554 + ... + 141543.

It is an arithmetic number, because the mean of its divisors is an integer number (11001822).

Almost surely, 2^139638015 is an apocalyptic number.

139638015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

139638015 is a deficient number, since it is larger than the sum of its proper divisors (124405713).

139638015 is a wasteful number, since it uses less digits than its factorization.

139638015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282119 (or 282116 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 139638015 is about 11816.8530074635. The cubic root of 139638015 is about 518.8014989275.

The spelling of 139638015 in words is "one hundred thirty-nine million, six hundred thirty-eight thousand, fifteen".