6440331 has 16 divisors (see below), whose sum is σ = 9340704. Its totient is φ = 3930624.

The previous prime is 6440327. The next prime is 6440341. The reversal of 6440331 is 1330446.

It is not a de Polignac number, because 6440331 - 2² = 6440327 is a prime.

It is a super-2 number, since 2×6440331² = 82955726779122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6440298 and 6440307.

It is not an unprimeable number, because it can be changed into a prime (6440311) 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, 181 + ... + 3593.

It is an arithmetic number, because the mean of its divisors is an integer number (583794).

Almost surely, 2^6440331 is an apocalyptic number.

6440331 is a deficient number, since it is larger than the sum of its proper divisors (2900373).

6440331 is a wasteful number, since it uses less digits than its factorization.

6440331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3470.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 6440331 is about 2537.7807233881. The cubic root of 6440331 is about 186.0527368093.

Adding to 6440331 its reverse (1330446), we get a palindrome (7770777).

The spelling of 6440331 in words is "six million, four hundred forty thousand, three hundred thirty-one".