3947744431 has 4 divisors (see below), whose sum is σ = 3992101200. Its totient is φ = 3903387664.

The previous prime is 3947744419. The next prime is 3947744459. The reversal of 3947744431 is 1344477493.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3947744431 - 2⁷ = 3947744303 is a prime.

It is a super-2 number, since 2×3947744431² = 31169372184983027522, which 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 (3947744231) 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, 22178251 + ... + 22178428.

It is an arithmetic number, because the mean of its divisors is an integer number (998025300).

Almost surely, 2^3947744431 is an apocalyptic number.

3947744431 is a deficient number, since it is larger than the sum of its proper divisors (44356769).

3947744431 is an equidigital number, since it uses as much as digits as its factorization.

3947744431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44356768.

The product of its digits is 1016064, while the sum is 46.

The square root of 3947744431 is about 62831.0785439817. The cubic root of 3947744431 is about 1580.4581845619.

The spelling of 3947744431 in words is "three billion, nine hundred forty-seven million, seven hundred forty-four thousand, four hundred thirty-one".