139858657 has 2 divisors, whose sum is σ = 139858658. Its totient is φ = 139858656.

The previous prime is 139858651. The next prime is 139858673. The reversal of 139858657 is 756858931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100620961 + 39237696 = 10031^2 + 6264^2 .

It is an emirp because it is prime and its reverse (756858931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139858657 is a prime.

It is not a weakly prime, because it can be changed into another prime (139858651) 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 as a sum of consecutive naturals, namely, 69929328 + 69929329.

It is an arithmetic number, because the mean of its divisors is an integer number (69929329).

Almost surely, 2^139858657 is an apocalyptic number.

It is an amenable number.

139858657 is a deficient number, since it is larger than the sum of its proper divisors (1).

139858657 is an equidigital number, since it uses as much as digits as its factorization.

139858657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 52.

The square root of 139858657 is about 11826.1852260143. The cubic root of 139858657 is about 519.0746078470.

The spelling of 139858657 in words is "one hundred thirty-nine million, eight hundred fifty-eight thousand, six hundred fifty-seven".