39979697993 has 2 divisors, whose sum is σ = 39979697994. Its totient is φ = 39979697992.

The previous prime is 39979697977. The next prime is 39979698041.

It is a happy number.

39979697993 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30378049849 + 9601648144 = 174293^2 + 97988^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 39979697993 - 2⁴ = 39979697977 is a prime.

It is a super-2 number, since 2×39979697993² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39979696993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19989848996 + 19989848997.

It is an arithmetic number, because the mean of its divisors is an integer number (19989848997).

Almost surely, 2^39979697993 is an apocalyptic number.

It is an amenable number.

39979697993 is a deficient number, since it is larger than the sum of its proper divisors (1).

39979697993 is an equidigital number, since it uses as much as digits as its factorization.

39979697993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1406192886, while the sum is 80.

The spelling of 39979697993 in words is "thirty-nine billion, nine hundred seventy-nine million, six hundred ninety-seven thousand, nine hundred ninety-three".