39972404761 has 3 divisors (see below), whose sum is σ = 39972604693. Its totient is φ = 39972204830.

The previous prime is 39972404713. The next prime is 39972404779. The reversal of 39972404761 is 16740427993.

The square root of 39972404761 is 199931.

It is a perfect power (a square), and thus also a powerful number.

39972404761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 16740427993 = 47 ⋅356179319.

It is not a de Polignac number, because 39972404761 - 2¹¹ = 39972402713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39972404699 and 39972404708.

It is not an unprimeable number, because it can be changed into a prime (39972404711) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 99966 + ... + 299896.

Almost surely, 2^39972404761 is an apocalyptic number.

39972404761 is the 199931-st square number.

39972404761 is the 99966-th centered octagonal number.

It is an amenable number.

39972404761 is a deficient number, since it is larger than the sum of its proper divisors (199932).

39972404761 is an frugal number, since it uses more digits than its factorization.

39972404761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399862 (or 199931 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 52.

The spelling of 39972404761 in words is "thirty-nine billion, nine hundred seventy-two million, four hundred four thousand, seven hundred sixty-one".