139239717 has 16 divisors (see below), whose sum is σ = 188112960. Its totient is φ = 91602432.

The previous prime is 139239697. The next prime is 139239743. The reversal of 139239717 is 717932931.

It is not a de Polignac number, because 139239717 - 2¹⁴ = 139223333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139239017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179743 + ... + 180515.

It is an arithmetic number, because the mean of its divisors is an integer number (11757060).

Almost surely, 2^139239717 is an apocalyptic number.

It is an amenable number.

139239717 is a deficient number, since it is larger than the sum of its proper divisors (48873243).

139239717 is an equidigital number, since it uses as much as digits as its factorization.

139239717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492.

The product of its digits is 71442, while the sum is 42.

The square root of 139239717 is about 11799.9880084685. The cubic root of 139239717 is about 518.3077595026.

The spelling of 139239717 in words is "one hundred thirty-nine million, two hundred thirty-nine thousand, seven hundred seventeen".