138990759 has 32 divisors (see below), whose sum is σ = 204488640. Its totient is φ = 83607552.

The previous prime is 138990743. The next prime is 138990767. The reversal of 138990759 is 957099831.

It is a happy number.

It is not a de Polignac number, because 138990759 - 2⁴ = 138990743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138990769) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137247 + ... + 138255.

It is an arithmetic number, because the mean of its divisors is an integer number (6390270).

Almost surely, 2^138990759 is an apocalyptic number.

138990759 is a deficient number, since it is larger than the sum of its proper divisors (65497881).

138990759 is a wasteful number, since it uses less digits than its factorization.

138990759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139.

The product of its (nonzero) digits is 612360, while the sum is 51.

The square root of 138990759 is about 11789.4342103428. The cubic root of 138990759 is about 517.9986670310.

The spelling of 138990759 in words is "one hundred thirty-eight million, nine hundred ninety thousand, seven hundred fifty-nine".