139646839 has 2 divisors, whose sum is σ = 139646840. Its totient is φ = 139646838.

The previous prime is 139646833. The next prime is 139646849. The reversal of 139646839 is 938646931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139646839 - 2³ = 139646831 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 139646792 and 139646801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139646831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69823419 + 69823420.

It is an arithmetic number, because the mean of its divisors is an integer number (69823420).

Almost surely, 2^139646839 is an apocalyptic number.

139646839 is a deficient number, since it is larger than the sum of its proper divisors (1).

139646839 is an equidigital number, since it uses as much as digits as its factorization.

139646839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 49.

The square root of 139646839 is about 11817.2263666226. The cubic root of 139646839 is about 518.8124267254.

The spelling of 139646839 in words is "one hundred thirty-nine million, six hundred forty-six thousand, eight hundred thirty-nine".