38640739431 has 16 divisors (see below), whose sum is σ = 60082784000. Its totient is φ = 22080421944.

The previous prime is 38640739429. The next prime is 38640739447. The reversal of 38640739431 is 13493704683.

It is not a de Polignac number, because 38640739431 - 2¹ = 38640739429 is a prime.

It is a super-2 number, since 2×38640739431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38640739481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18774841 + ... + 18776898.

It is an arithmetic number, because the mean of its divisors is an integer number (3755174000).

Almost surely, 2^38640739431 is an apocalyptic number.

38640739431 is a deficient number, since it is larger than the sum of its proper divisors (21442044569).

38640739431 is an equidigital number, since it uses as much as digits as its factorization.

38640739431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37551763 (or 37551749 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 48.

The spelling of 38640739431 in words is "thirty-eight billion, six hundred forty million, seven hundred thirty-nine thousand, four hundred thirty-one".