138136877 has 4 divisors (see below), whose sum is σ = 140478240. Its totient is φ = 135795516.

The previous prime is 138136841. The next prime is 138136907. The reversal of 138136877 is 778631831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138136877 - 2⁶ = 138136813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138136177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1170593 + ... + 1170710.

It is an arithmetic number, because the mean of its divisors is an integer number (35119560).

Almost surely, 2^138136877 is an apocalyptic number.

It is an amenable number.

138136877 is a deficient number, since it is larger than the sum of its proper divisors (2341363).

138136877 is an equidigital number, since it uses as much as digits as its factorization.

138136877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2341362.

The product of its digits is 169344, while the sum is 44.

The square root of 138136877 is about 11753.1645525790. The cubic root of 138136877 is about 516.9357219989.

The spelling of 138136877 in words is "one hundred thirty-eight million, one hundred thirty-six thousand, eight hundred seventy-seven".