138901277 has 4 divisors (see below), whose sum is σ = 138925116. Its totient is φ = 138877440.

The previous prime is 138901253. The next prime is 138901283. The reversal of 138901277 is 772109831.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11978521 + 126922756 = 3461^2 + 11266^2 .

It is a cyclic number.

It is not a de Polignac number, because 138901277 - 2²⁴ = 122124061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138901277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138904277) 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, 3293 + ... + 16989.

It is an arithmetic number, because the mean of its divisors is an integer number (34731279).

Almost surely, 2^138901277 is an apocalyptic number.

It is an amenable number.

138901277 is a deficient number, since it is larger than the sum of its proper divisors (23839).

138901277 is a wasteful number, since it uses less digits than its factorization.

138901277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23838.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 138901277 is about 11785.6385910989. The cubic root of 138901277 is about 517.8874809645.

The spelling of 138901277 in words is "one hundred thirty-eight million, nine hundred one thousand, two hundred seventy-seven".