6440130431 has 8 divisors (see below), whose sum is σ = 7416334464. Its totient is φ = 5477972760.

The previous prime is 6440130413. The next prime is 6440130457. The reversal of 6440130431 is 1340310446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6440130431 - 2¹⁸ = 6439868287 is a prime.

It is a super-2 number, since 2×6440130431² = 82950559936584491522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6440130431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440130401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3510605 + ... + 3512438.

It is an arithmetic number, because the mean of its divisors is an integer number (927041808).

Almost surely, 2^6440130431 is an apocalyptic number.

6440130431 is a deficient number, since it is larger than the sum of its proper divisors (976204033).

6440130431 is a wasteful number, since it uses less digits than its factorization.

6440130431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7023181.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 6440130431 is about 80250.4232449898. The cubic root of 6440130431 is about 1860.5080539721.

Adding to 6440130431 its reverse (1340310446), we get a palindrome (7780440877).

The spelling of 6440130431 in words is "six billion, four hundred forty million, one hundred thirty thousand, four hundred thirty-one".