139979039 has 4 divisors (see below), whose sum is σ = 140194056. Its totient is φ = 139764024.

The previous prime is 139979009. The next prime is 139979041. The reversal of 139979039 is 930979931.

It is a happy number.

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-139979039 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 (139979009) 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, 106529 + ... + 107834.

It is an arithmetic number, because the mean of its divisors is an integer number (35048514).

Almost surely, 2^139979039 is an apocalyptic number.

139979039 is a deficient number, since it is larger than the sum of its proper divisors (215017).

139979039 is an equidigital number, since it uses as much as digits as its factorization.

139979039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215016.

The product of its (nonzero) digits is 413343, while the sum is 50.

The square root of 139979039 is about 11831.2737691256. The cubic root of 139979039 is about 519.2234946372.

The spelling of 139979039 in words is "one hundred thirty-nine million, nine hundred seventy-nine thousand, thirty-nine".