139859957 has 2 divisors, whose sum is σ = 139859958. Its totient is φ = 139859956.

The previous prime is 139859939. The next prime is 139859999. The reversal of 139859957 is 759958931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123787876 + 16072081 = 11126^2 + 4009^2 .

It is an emirp because it is prime and its reverse (759958931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139859957 - 2⁸ = 139859701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139859557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69929978 + 69929979.

It is an arithmetic number, because the mean of its divisors is an integer number (69929979).

Almost surely, 2^139859957 is an apocalyptic number.

It is an amenable number.

139859957 is a deficient number, since it is larger than the sum of its proper divisors (1).

139859957 is an equidigital number, since it uses as much as digits as its factorization.

139859957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3061800, while the sum is 56.

The square root of 139859957 is about 11826.2401886652. The cubic root of 139859957 is about 519.0762161252.

The spelling of 139859957 in words is "one hundred thirty-nine million, eight hundred fifty-nine thousand, nine hundred fifty-seven".