138790615 has 8 divisors (see below), whose sum is σ = 166613328. Its totient is φ = 110989440.

The previous prime is 138790591. The next prime is 138790621. The reversal of 138790615 is 516097831.

138790615 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 138790615 - 2¹⁹ = 138266327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18175 + ... + 24655.

It is an arithmetic number, because the mean of its divisors is an integer number (20826666).

Almost surely, 2^138790615 is an apocalyptic number.

138790615 is a deficient number, since it is larger than the sum of its proper divisors (27822713).

138790615 is an equidigital number, since it uses as much as digits as its factorization.

138790615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10769.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 138790615 is about 11780.9428739808. The cubic root of 138790615 is about 517.7499115770.

The spelling of 138790615 in words is "one hundred thirty-eight million, seven hundred ninety thousand, six hundred fifteen".