139598639 has 2 divisors, whose sum is σ = 139598640. Its totient is φ = 139598638.

The previous prime is 139598623. The next prime is 139598659. The reversal of 139598639 is 936895931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139598639 - 2⁴ = 139598623 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139598659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69799319 + 69799320.

It is an arithmetic number, because the mean of its divisors is an integer number (69799320).

Almost surely, 2^139598639 is an apocalyptic number.

139598639 is a deficient number, since it is larger than the sum of its proper divisors (1).

139598639 is an equidigital number, since it uses as much as digits as its factorization.

139598639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1574640, while the sum is 53.

The square root of 139598639 is about 11815.1867949686. The cubic root of 139598639 is about 518.7527293803.

The spelling of 139598639 in words is "one hundred thirty-nine million, five hundred ninety-eight thousand, six hundred thirty-nine".