39426470721 has 45 divisors (see below), whose sum is σ = 62758624305. Its totient is φ = 23851147320.

The previous prime is 39426470719. The next prime is 39426470731. The reversal of 39426470721 is 12707462493.

The square root of 39426470721 is 198561.

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

39426470721 is a `hidden beast` number, since 3 + 94 + 26 + 470 + 72 + 1 = 666.

It is not a de Polignac number, because 39426470721 - 2¹ = 39426470719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39426470731) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 72077370 + ... + 72077916.

Almost surely, 2^39426470721 is an apocalyptic number.

39426470721 is the 198561-st square number.

39426470721 is the 99281-st centered octagonal number.

It is an amenable number.

39426470721 is a deficient number, since it is larger than the sum of its proper divisors (23332153584).

39426470721 is an frugal number, since it uses more digits than its factorization.

39426470721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144 (or 561 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The spelling of 39426470721 in words is "thirty-nine billion, four hundred twenty-six million, four hundred seventy thousand, seven hundred twenty-one".