138902915 has 4 divisors (see below), whose sum is σ = 166683504. Its totient is φ = 111122328.

The previous prime is 138902899. The next prime is 138902963. The reversal of 138902915 is 519209831.

138902915 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138902915 - 2⁴ = 138902899 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13890287 + ... + 13890296.

It is an arithmetic number, because the mean of its divisors is an integer number (41670876).

Almost surely, 2^138902915 is an apocalyptic number.

138902915 is a deficient number, since it is larger than the sum of its proper divisors (27780589).

138902915 is an equidigital number, since it uses as much as digits as its factorization.

138902915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27780588.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 138902915 is about 11785.7080822494. The cubic root of 138902915 is about 517.8895166942.

The spelling of 138902915 in words is "one hundred thirty-eight million, nine hundred two thousand, nine hundred fifteen".