139606939 has 4 divisors (see below), whose sum is σ = 142853656. Its totient is φ = 136360224.

The previous prime is 139606937. The next prime is 139606949. The reversal of 139606939 is 939606931.

139606939 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.

It is not a de Polignac number, because 139606939 - 2¹ = 139606937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139606931) 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, 1623294 + ... + 1623379.

It is an arithmetic number, because the mean of its divisors is an integer number (35713414).

Almost surely, 2^139606939 is an apocalyptic number.

139606939 is a deficient number, since it is larger than the sum of its proper divisors (3246717).

139606939 is an equidigital number, since it uses as much as digits as its factorization.

139606939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3246716.

The product of its (nonzero) digits is 236196, while the sum is 46.

The square root of 139606939 is about 11815.5380326077. The cubic root of 139606939 is about 518.7630101929.

The spelling of 139606939 in words is "one hundred thirty-nine million, six hundred six thousand, nine hundred thirty-nine".