138791015 has 8 divisors (see below), whose sum is σ = 181690128. Its totient is φ = 100938880.

The previous prime is 138790997. The next prime is 138791017. The reversal of 138791015 is 510197831.

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

It is not a de Polignac number, because 138791015 - 2¹⁰ = 138789991 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 (138791017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1261682 + ... + 1261791.

It is an arithmetic number, because the mean of its divisors is an integer number (22711266).

Almost surely, 2^138791015 is an apocalyptic number.

138791015 is a deficient number, since it is larger than the sum of its proper divisors (42899113).

138791015 is a wasteful number, since it uses less digits than its factorization.

138791015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2523489.

The product of its (nonzero) digits is 7560, while the sum is 35.

The square root of 138791015 is about 11780.9598505385. The cubic root of 138791015 is about 517.7504089683.

The spelling of 138791015 in words is "one hundred thirty-eight million, seven hundred ninety-one thousand, fifteen".