39985973099 has 4 divisors (see below), whose sum is σ = 39986386080. Its totient is φ = 39985560120.

The previous prime is 39985973039. The next prime is 39985973101. The reversal of 39985973099 is 99037958993.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 99037958993 = 9643 ⋅10270451.

It is a cyclic number.

It is not a de Polignac number, because 39985973099 - 2¹² = 39985969003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39985973039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25997 + ... + 283985.

It is an arithmetic number, because the mean of its divisors is an integer number (9996596520).

Almost surely, 2^39985973099 is an apocalyptic number.

39985973099 is a deficient number, since it is larger than the sum of its proper divisors (412981).

39985973099 is a wasteful number, since it uses less digits than its factorization.

39985973099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412980.

The product of its (nonzero) digits is 148803480, while the sum is 71.

The spelling of 39985973099 in words is "thirty-nine billion, nine hundred eighty-five million, nine hundred seventy-three thousand, ninety-nine".