138117315 has 32 divisors (see below), whose sum is σ = 258725376. Its totient is φ = 61597440.

The previous prime is 138117313. The next prime is 138117319. The reversal of 138117315 is 513711831.

It is not a de Polignac number, because 138117315 - 2¹ = 138117313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138117313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11737 + ... + 20346.

It is an arithmetic number, because the mean of its divisors is an integer number (8085168).

Almost surely, 2^138117315 is an apocalyptic number.

138117315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138117315 is a deficient number, since it is larger than the sum of its proper divisors (120608061).

138117315 is a wasteful number, since it uses less digits than its factorization.

138117315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32139.

The product of its digits is 2520, while the sum is 30.

The square root of 138117315 is about 11752.3323217138. The cubic root of 138117315 is about 516.9113192128.

The spelling of 138117315 in words is "one hundred thirty-eight million, one hundred seventeen thousand, three hundred fifteen".