138807953 has 4 divisors (see below), whose sum is σ = 139739700. Its totient is φ = 137876208.

The previous prime is 138807931. The next prime is 138807959. The reversal of 138807953 is 359708831.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18861649 + 119946304 = 4343^2 + 10952^2 .

It is a cyclic number.

It is not a de Polignac number, because 138807953 - 2¹⁸ = 138545809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138807959) 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, 465650 + ... + 465947.

It is an arithmetic number, because the mean of its divisors is an integer number (34934925).

Almost surely, 2^138807953 is an apocalyptic number.

It is an amenable number.

138807953 is a deficient number, since it is larger than the sum of its proper divisors (931747).

138807953 is an equidigital number, since it uses as much as digits as its factorization.

138807953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931746.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 138807953 is about 11781.6787004230. The cubic root of 138807953 is about 517.7714701293.

The spelling of 138807953 in words is "one hundred thirty-eight million, eight hundred seven thousand, nine hundred fifty-three".