139575917 has 12 divisors (see below), whose sum is σ = 152545140. Its totient is φ = 127640448.

The previous prime is 139575913. The next prime is 139575959. The reversal of 139575917 is 719575931.

It can be written as a sum of positive squares in 6 ways, for example, as 49970761 + 89605156 = 7069^2 + 9466^2 .

It is not a de Polignac number, because 139575917 - 2² = 139575913 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139575911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14633 + ... + 22209.

It is an arithmetic number, because the mean of its divisors is an integer number (12712095).

Almost surely, 2^139575917 is an apocalyptic number.

It is an amenable number.

139575917 is a deficient number, since it is larger than the sum of its proper divisors (12969223).

139575917 is a wasteful number, since it uses less digits than its factorization.

139575917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7712 (or 7699 counting only the distinct ones).

The product of its digits is 297675, while the sum is 47.

The square root of 139575917 is about 11814.2251967702. The cubic root of 139575917 is about 518.7245826420.

The spelling of 139575917 in words is "one hundred thirty-nine million, five hundred seventy-five thousand, nine hundred seventeen".