39640013639 has 2 divisors, whose sum is σ = 39640013640. Its totient is φ = 39640013638.

The previous prime is 39640013599. The next prime is 39640013659. The reversal of 39640013639 is 93631004693.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39640013639 - 2⁸ = 39640013383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39640013639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39640013659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19820006819 + 19820006820.

It is an arithmetic number, because the mean of its divisors is an integer number (19820006820).

Almost surely, 2^39640013639 is an apocalyptic number.

39640013639 is a deficient number, since it is larger than the sum of its proper divisors (1).

39640013639 is an equidigital number, since it uses as much as digits as its factorization.

39640013639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 44.

The spelling of 39640013639 in words is "thirty-nine billion, six hundred forty million, thirteen thousand, six hundred thirty-nine".