139979913 has 4 divisors (see below), whose sum is σ = 186639888. Its totient is φ = 93319940.

The previous prime is 139979899. The next prime is 139979947. The reversal of 139979913 is 319979931.

139979913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 139979913 - 2⁵ = 139979881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139978913) 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, 23329983 + ... + 23329988.

It is an arithmetic number, because the mean of its divisors is an integer number (46659972).

Almost surely, 2^139979913 is an apocalyptic number.

It is an amenable number.

139979913 is a deficient number, since it is larger than the sum of its proper divisors (46659975).

139979913 is an equidigital number, since it uses as much as digits as its factorization.

139979913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46659974.

The product of its digits is 413343, while the sum is 51.

The square root of 139979913 is about 11831.3107050741. The cubic root of 139979913 is about 519.2245752761.

The spelling of 139979913 in words is "one hundred thirty-nine million, nine hundred seventy-nine thousand, nine hundred thirteen".