139345879 has 4 divisors (see below), whose sum is σ = 140409720. Its totient is φ = 138282040.

The previous prime is 139345861. The next prime is 139345901. The reversal of 139345879 is 978543931.

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 139345879 - 2⁵ = 139345847 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 (139345859) 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, 531724 + ... + 531985.

It is an arithmetic number, because the mean of its divisors is an integer number (35102430).

Almost surely, 2^139345879 is an apocalyptic number.

139345879 is a deficient number, since it is larger than the sum of its proper divisors (1063841).

139345879 is a wasteful number, since it uses less digits than its factorization.

139345879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063840.

The product of its digits is 816480, while the sum is 49.

The square root of 139345879 is about 11804.4855457576. The cubic root of 139345879 is about 518.4394523154.

The spelling of 139345879 in words is "one hundred thirty-nine million, three hundred forty-five thousand, eight hundred seventy-nine".