6440312 has 16 divisors (see below), whose sum is σ = 12465600. Its totient is φ = 3116160.

The previous prime is 6440311. The next prime is 6440327. The reversal of 6440312 is 2130446.

It is a happy number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 12737 + ... + 13232.

It is an arithmetic number, because the mean of its divisors is an integer number (779100).

Almost surely, 2^6440312 is an apocalyptic number.

6440312 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

6440312 is a deficient number, since it is larger than the sum of its proper divisors (6025288).

6440312 is a wasteful number, since it uses less digits than its factorization.

6440312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26006 (or 26002 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 6440312 is about 2537.7769799571. The cubic root of 6440312 is about 186.0525538474.

Adding to 6440312 its reverse (2130446), we get a palindrome (8570758).

The spelling of 6440312 in words is "six million, four hundred forty thousand, three hundred twelve".