6400331 has 6 divisors (see below), whose sum is σ = 7445340. Its totient is φ = 5485956.

The previous prime is 6400259. The next prime is 6400349. The reversal of 6400331 is 1330046.

It is a de Polignac number, because none of the positive numbers 2^k-6400331 is a prime.

It is a super-2 number, since 2×6400331² = 81928473819122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6400391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 65261 + ... + 65358.

It is an arithmetic number, because the mean of its divisors is an integer number (1240890).

Almost surely, 2^6400331 is an apocalyptic number.

6400331 is a deficient number, since it is larger than the sum of its proper divisors (1045009).

6400331 is a wasteful number, since it uses less digits than its factorization.

6400331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130633 (or 130626 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 6400331 is about 2529.8875469080. The cubic root of 6400331 is about 185.6667540516. Note that the first 3 decimals are identical.

Adding to 6400331 its reverse (1330046), we get a palindrome (7730377).

The spelling of 6400331 in words is "six million, four hundred thousand, three hundred thirty-one".