39979929593 has 2 divisors, whose sum is σ = 39979929594. Its totient is φ = 39979929592.

The previous prime is 39979929559. The next prime is 39979929611. The reversal of 39979929593 is 39592997993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39797058064 + 182871529 = 199492^2 + 13523^2 .

It is a cyclic number.

It is not a de Polignac number, because 39979929593 - 2²⁴ = 39963152377 is a prime.

It is a super-2 number, since 2×39979929593² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 39979929593.

It is not a weakly prime, because it can be changed into another prime (39979929533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19989964796 + 19989964797.

It is an arithmetic number, because the mean of its divisors is an integer number (19989964797).

Almost surely, 2^39979929593 is an apocalyptic number.

It is an amenable number.

39979929593 is a deficient number, since it is larger than the sum of its proper divisors (1).

39979929593 is an equidigital number, since it uses as much as digits as its factorization.

39979929593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 334807830, while the sum is 74.

The spelling of 39979929593 in words is "thirty-nine billion, nine hundred seventy-nine million, nine hundred twenty-nine thousand, five hundred ninety-three".