138900959 has 4 divisors (see below), whose sum is σ = 140249616. Its totient is φ = 137552304.

The previous prime is 138900947. The next prime is 138900961. The reversal of 138900959 is 959009831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138900959 - 2⁴ = 138900943 is a prime.

It is a super-2 number, since 2×138900959² = 38586952822239362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138900259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 674174 + ... + 674379.

It is an arithmetic number, because the mean of its divisors is an integer number (35062404).

Almost surely, 2^138900959 is an apocalyptic number.

138900959 is a deficient number, since it is larger than the sum of its proper divisors (1348657).

138900959 is a wasteful number, since it uses less digits than its factorization.

138900959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348656.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 138900959 is about 11785.6251000955. The cubic root of 138900959 is about 517.8870857477.

The spelling of 138900959 in words is "one hundred thirty-eight million, nine hundred thousand, nine hundred fifty-nine".