139235939 has 2 divisors, whose sum is σ = 139235940. Its totient is φ = 139235938.

The previous prime is 139235897. The next prime is 139235953. The reversal of 139235939 is 939532931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139235939 - 2¹² = 139231843 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139235939.

It is not a weakly prime, because it can be changed into another prime (139235969) 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, 69617969 + 69617970.

It is an arithmetic number, because the mean of its divisors is an integer number (69617970).

Almost surely, 2^139235939 is an apocalyptic number.

139235939 is a deficient number, since it is larger than the sum of its proper divisors (1).

139235939 is an equidigital number, since it uses as much as digits as its factorization.

139235939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 196830, while the sum is 44.

The square root of 139235939 is about 11799.8279224741. The cubic root of 139235939 is about 518.3030717012.

The spelling of 139235939 in words is "one hundred thirty-nine million, two hundred thirty-five thousand, nine hundred thirty-nine".