6440344231 has 8 divisors (see below), whose sum is σ = 6503276160. Its totient is φ = 6377463288.

The previous prime is 6440344219. The next prime is 6440344279. The reversal of 6440344231 is 1324430446.

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 6440344231 - 2¹⁵ = 6440311463 is a prime.

It is a super-2 number, since 2×6440344231² = 82956067627549962722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6440344193 and 6440344202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440344531) 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, 271860 + ... + 294598.

It is an arithmetic number, because the mean of its divisors is an integer number (812909520).

Almost surely, 2^6440344231 is an apocalyptic number.

6440344231 is a deficient number, since it is larger than the sum of its proper divisors (62931929).

6440344231 is a wasteful number, since it uses less digits than its factorization.

6440344231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25493.

The product of its (nonzero) digits is 27648, while the sum is 31.

The square root of 6440344231 is about 80251.7553141363. The cubic root of 6440344231 is about 1860.5286421794.

Adding to 6440344231 its reverse (1324430446), we get a palindrome (7764774677).

The spelling of 6440344231 in words is "six billion, four hundred forty million, three hundred forty-four thousand, two hundred thirty-one".