139979839 has 8 divisors (see below), whose sum is σ = 146243520. Its totient is φ = 133812000.

The previous prime is 139979831. The next prime is 139979857. The reversal of 139979839 is 938979931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139979839 - 2³ = 139979831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139979831) 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 7 ways as a sum of consecutive naturals, for example, 20967 + ... + 26824.

It is an arithmetic number, because the mean of its divisors is an integer number (18280440).

Almost surely, 2^139979839 is an apocalyptic number.

139979839 is a deficient number, since it is larger than the sum of its proper divisors (6263681).

139979839 is a wasteful number, since it uses less digits than its factorization.

139979839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47921.

The product of its digits is 3306744, while the sum is 58.

The square root of 139979839 is about 11831.3075777785. The cubic root of 139979839 is about 519.2244837805.

The spelling of 139979839 in words is "one hundred thirty-nine million, nine hundred seventy-nine thousand, eight hundred thirty-nine".