139396525 has 6 divisors (see below), whose sum is σ = 172851722. Its totient is φ = 111517200.

The previous prime is 139396489. The next prime is 139396589. The reversal of 139396525 is 525693931.

It can be written as a sum of positive squares in 3 ways, for example, as 37527876 + 101868649 = 6126^2 + 10093^2 .

It is not a de Polignac number, because 139396525 - 2⁹ = 139396013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2787906 + ... + 2787955.

Almost surely, 2^139396525 is an apocalyptic number.

It is an amenable number.

139396525 is a deficient number, since it is larger than the sum of its proper divisors (33455197).

139396525 is an equidigital number, since it uses as much as digits as its factorization.

139396525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5575871 (or 5575866 counting only the distinct ones).

The product of its digits is 218700, while the sum is 43.

The square root of 139396525 is about 11806.6305523634. The cubic root of 139396525 is about 518.5022545651.

The spelling of 139396525 in words is "one hundred thirty-nine million, three hundred ninety-six thousand, five hundred twenty-five".