139565939 has 2 divisors, whose sum is σ = 139565940. Its totient is φ = 139565938.

The previous prime is 139565879. The next prime is 139565953. The reversal of 139565939 is 939565931.

139565939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139565939 - 2⁸ = 139565683 is a prime.

It is not a weakly prime, because it can be changed into another prime (139565039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69782969 + 69782970.

It is an arithmetic number, because the mean of its divisors is an integer number (69782970).

Almost surely, 2^139565939 is an apocalyptic number.

139565939 is a deficient number, since it is larger than the sum of its proper divisors (1).

139565939 is an equidigital number, since it uses as much as digits as its factorization.

139565939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 984150, while the sum is 50.

The square root of 139565939 is about 11813.8029016909. The cubic root of 139565939 is about 518.7122214904.

The spelling of 139565939 in words is "one hundred thirty-nine million, five hundred sixty-five thousand, nine hundred thirty-nine".