139279939 has 4 divisors (see below), whose sum is σ = 139353280. Its totient is φ = 139206600.

The previous prime is 139279891. The next prime is 139279949. The reversal of 139279939 is 939972931.

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-139279939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139279949) 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, 33744 + ... + 37645.

It is an arithmetic number, because the mean of its divisors is an integer number (34838320).

Almost surely, 2^139279939 is an apocalyptic number.

139279939 is a deficient number, since it is larger than the sum of its proper divisors (73341).

139279939 is an equidigital number, since it uses as much as digits as its factorization.

139279939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73340.

The product of its digits is 826686, while the sum is 52.

The square root of 139279939 is about 11801.6922091707. The cubic root of 139279939 is about 518.3576623323.

The spelling of 139279939 in words is "one hundred thirty-nine million, two hundred seventy-nine thousand, nine hundred thirty-nine".