138013915 has 16 divisors (see below), whose sum is σ = 186113088. Its totient is φ = 97485696.

The previous prime is 138013901. The next prime is 138013943. The reversal of 138013915 is 519310831.

It is a cyclic number.

It is not a de Polignac number, because 138013915 - 2⁷ = 138013787 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44664 + ... + 47653.

It is an arithmetic number, because the mean of its divisors is an integer number (11632068).

Almost surely, 2^138013915 is an apocalyptic number.

138013915 is a deficient number, since it is larger than the sum of its proper divisors (48099173).

138013915 is a wasteful number, since it uses less digits than its factorization.

138013915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92358.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 138013915 is about 11747.9323712728. The cubic root of 138013915 is about 516.7822936959.

The spelling of 138013915 in words is "one hundred thirty-eight million, thirteen thousand, nine hundred fifteen".