139426657 has 2 divisors, whose sum is σ = 139426658. Its totient is φ = 139426656.

The previous prime is 139426649. The next prime is 139426669. The reversal of 139426657 is 756624931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138862656 + 564001 = 11784^2 + 751^2 .

It is a cyclic number.

It is not a de Polignac number, because 139426657 - 2³ = 139426649 is a prime.

It is not a weakly prime, because it can be changed into another prime (139426627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69713328 + 69713329.

It is an arithmetic number, because the mean of its divisors is an integer number (69713329).

Almost surely, 2^139426657 is an apocalyptic number.

It is an amenable number.

139426657 is a deficient number, since it is larger than the sum of its proper divisors (1).

139426657 is an equidigital number, since it uses as much as digits as its factorization.

139426657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 43.

The square root of 139426657 is about 11807.9065460394. The cubic root of 139426657 is about 518.5396117478.

The spelling of 139426657 in words is "one hundred thirty-nine million, four hundred twenty-six thousand, six hundred fifty-seven".