139992657 has 24 divisors (see below), whose sum is σ = 224625600. Its totient is φ = 77234976.

The previous prime is 139992623. The next prime is 139992667. The reversal of 139992657 is 756299931.

It is a happy number.

It is not a de Polignac number, because 139992657 - 2²⁴ = 123215441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139992667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12157 + ... + 20682.

It is an arithmetic number, because the mean of its divisors is an integer number (9359400).

Almost surely, 2^139992657 is an apocalyptic number.

It is an amenable number.

139992657 is a deficient number, since it is larger than the sum of its proper divisors (84632943).

139992657 is a wasteful number, since it uses less digits than its factorization.

139992657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32885 (or 32878 counting only the distinct ones).

The product of its digits is 918540, while the sum is 51.

The square root of 139992657 is about 11831.8492637457. The cubic root of 139992657 is about 519.2403318159.

The spelling of 139992657 in words is "one hundred thirty-nine million, nine hundred ninety-two thousand, six hundred fifty-seven".