138108015 has 24 divisors (see below), whose sum is σ = 239768880. Its totient is φ = 73540224.

The previous prime is 138107999. The next prime is 138108023. The reversal of 138108015 is 510801831.

It is not a de Polignac number, because 138108015 - 2⁴ = 138107999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138108015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31179 + ... + 35331.

It is an arithmetic number, because the mean of its divisors is an integer number (9990370).

Almost surely, 2^138108015 is an apocalyptic number.

138108015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138108015 is a deficient number, since it is larger than the sum of its proper divisors (101660865).

138108015 is a wasteful number, since it uses less digits than its factorization.

138108015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4903 (or 4900 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 138108015 is about 11751.9366489103. The cubic root of 138108015 is about 516.8997170392.

Adding to 138108015 its reverse (510801831), we get a palindrome (648909846).

The spelling of 138108015 in words is "one hundred thirty-eight million, one hundred eight thousand, fifteen".