138987165 has 16 divisors (see below), whose sum is σ = 222753600. Its totient is φ = 74001792.

The previous prime is 138987157. The next prime is 138987179. The reversal of 138987165 is 561789831.

It is not a de Polignac number, because 138987165 - 2³ = 138987157 is a prime.

It is a Curzon number.

It is a congruent number.

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, 1801 + ... + 16769.

It is an arithmetic number, because the mean of its divisors is an integer number (13922100).

Almost surely, 2^138987165 is an apocalyptic number.

138987165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138987165 is a deficient number, since it is larger than the sum of its proper divisors (83766435).

138987165 is a wasteful number, since it uses less digits than its factorization.

138987165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15596.

The product of its digits is 362880, while the sum is 48.

The square root of 138987165 is about 11789.2817847399. The cubic root of 138987165 is about 517.9942022179.

The spelling of 138987165 in words is "one hundred thirty-eight million, nine hundred eighty-seven thousand, one hundred sixty-five".