139937879 has 4 divisors (see below), whose sum is σ = 143351040. Its totient is φ = 136524720.

The previous prime is 139937857. The next prime is 139937881. The reversal of 139937879 is 978739931.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139937879 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 (139937839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1706519 + ... + 1706600.

It is an arithmetic number, because the mean of its divisors is an integer number (35837760).

Almost surely, 2^139937879 is an apocalyptic number.

139937879 is a deficient number, since it is larger than the sum of its proper divisors (3413161).

139937879 is an equidigital number, since it uses as much as digits as its factorization.

139937879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3413160.

The product of its digits is 2571912, while the sum is 56.

The square root of 139937879 is about 11829.5341835594. The cubic root of 139937879 is about 519.1725981262.

The spelling of 139937879 in words is "one hundred thirty-nine million, nine hundred thirty-seven thousand, eight hundred seventy-nine".