138231315 has 24 divisors (see below), whose sum is σ = 239878080. Its totient is φ = 73638144.

The previous prime is 138231239. The next prime is 138231319. The reversal of 138231315 is 513132831.

138231315 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 138231315 - 2⁷ = 138231187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138231319) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65974 + ... + 68036.

It is an arithmetic number, because the mean of its divisors is an integer number (9994920).

Almost surely, 2^138231315 is an apocalyptic number.

138231315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138231315 is a deficient number, since it is larger than the sum of its proper divisors (101646765).

138231315 is a wasteful number, since it uses less digits than its factorization.

138231315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3563 (or 3560 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 138231315 is about 11757.1814224328. The cubic root of 138231315 is about 517.0534971024.

It can be divided in two parts, 13 and 8231315, that added together give a palindrome (8231328).

The spelling of 138231315 in words is "one hundred thirty-eight million, two hundred thirty-one thousand, three hundred fifteen".