239940813649639 has 2 divisors, whose sum is σ = 239940813649640. Its totient is φ = 239940813649638.

The previous prime is 239940813649619. The next prime is 239940813649687. The reversal of 239940813649639 is 936946318049932.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 239940813649639 - 2³⁷ = 239803374696167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (239940813649619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119970406824819 + 119970406824820.

It is an arithmetic number, because the mean of its divisors is an integer number (119970406824820).

Almost surely, 2^{239940813649639} is an apocalyptic number.

239940813649639 is a deficient number, since it is larger than the sum of its proper divisors (1).

239940813649639 is an equidigital number, since it uses as much as digits as its factorization.

239940813649639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632586752, while the sum is 76.

The spelling of 239940813649639 in words is "two hundred thirty-nine trillion, nine hundred forty billion, eight hundred thirteen million, six hundred forty-nine thousand, six hundred thirty-nine".