138755615 has 16 divisors (see below), whose sum is σ = 176655168. Its totient is φ = 104265216.

The previous prime is 138755611. The next prime is 138755623. The reversal of 138755615 is 516557831.

138755615 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138755615 - 2² = 138755611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138755611) 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, 50774 + ... + 53436.

It is an arithmetic number, because the mean of its divisors is an integer number (11040948).

Almost surely, 2^138755615 is an apocalyptic number.

138755615 is a deficient number, since it is larger than the sum of its proper divisors (37899553).

138755615 is a wasteful number, since it uses less digits than its factorization.

138755615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3298.

The product of its digits is 126000, while the sum is 41.

The square root of 138755615 is about 11779.4573304546. The cubic root of 138755615 is about 517.7063861307.

The spelling of 138755615 in words is "one hundred thirty-eight million, seven hundred fifty-five thousand, six hundred fifteen".