39991519997 has 48 divisors (see below), whose sum is σ = 49512456576. Its totient is φ = 31958784000.

The previous prime is 39991519963. The next prime is 39991520033. The reversal of 39991519997 is 79991519993.

It is not a de Polignac number, because 39991519997 - 2²⁶ = 39924411133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39991519997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39991519937) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10302497 + ... + 10306377.

It is an arithmetic number, because the mean of its divisors is an integer number (1031509512).

Almost surely, 2^39991519997 is an apocalyptic number.

It is an amenable number.

39991519997 is a deficient number, since it is larger than the sum of its proper divisors (9520936579).

39991519997 is a wasteful number, since it uses less digits than its factorization.

39991519997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4182 (or 4169 counting only the distinct ones).

The product of its digits is 55801305, while the sum is 71.

The spelling of 39991519997 in words is "thirty-nine billion, nine hundred ninety-one million, five hundred nineteen thousand, nine hundred ninety-seven".