138624815 has 16 divisors (see below), whose sum is σ = 190356480. Its totient is φ = 94935840.

The previous prime is 138624803. The next prime is 138624821. The reversal of 138624815 is 518426831.

It is not a de Polignac number, because 138624815 - 2¹⁸ = 138362671 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31946 + ... + 36024.

It is an arithmetic number, because the mean of its divisors is an integer number (11897280).

Almost surely, 2^138624815 is an apocalyptic number.

138624815 is a deficient number, since it is larger than the sum of its proper divisors (51731665).

138624815 is an equidigital number, since it uses as much as digits as its factorization.

138624815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5062.

The product of its digits is 46080, while the sum is 38.

The square root of 138624815 is about 11773.9039829616. The cubic root of 138624815 is about 517.5436605014.

The spelling of 138624815 in words is "one hundred thirty-eight million, six hundred twenty-four thousand, eight hundred fifteen".