139672657 has 2 divisors, whose sum is σ = 139672658. Its totient is φ = 139672656.

The previous prime is 139672627. The next prime is 139672681. The reversal of 139672657 is 756276931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113550336 + 26122321 = 10656^2 + 5111^2 .

It is a cyclic number.

It is not a de Polignac number, because 139672657 - 2¹⁹ = 139148369 is a prime.

It is a super-2 number, since 2×139672657² = 39016902226879298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (139672627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69836328 + 69836329.

It is an arithmetic number, because the mean of its divisors is an integer number (69836329).

Almost surely, 2^139672657 is an apocalyptic number.

It is an amenable number.

139672657 is a deficient number, since it is larger than the sum of its proper divisors (1).

139672657 is an equidigital number, since it uses as much as digits as its factorization.

139672657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 46.

The square root of 139672657 is about 11818.3187044520. The cubic root of 139672657 is about 518.8443975501.

The spelling of 139672657 in words is "one hundred thirty-nine million, six hundred seventy-two thousand, six hundred fifty-seven".