139403979 has 72 divisors (see below), whose sum is σ = 244964720. Its totient is φ = 75841920.

The previous prime is 139403959. The next prime is 139403983. The reversal of 139403979 is 979304931.

It is not a de Polignac number, because 139403979 - 2¹³ = 139395787 is a prime.

It is a super-2 number, since 2×139403979² = 38866938722064882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139403909) 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 71 ways as a sum of consecutive naturals, for example, 608637 + ... + 608865.

Almost surely, 2^139403979 is an apocalyptic number.

139403979 is a deficient number, since it is larger than the sum of its proper divisors (105560741).

139403979 is a wasteful number, since it uses less digits than its factorization.

139403979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 45.

The square root of 139403979 is about 11806.9462182226. The cubic root of 139403979 is about 518.5114964189.

The spelling of 139403979 in words is "one hundred thirty-nine million, four hundred three thousand, nine hundred seventy-nine".