6440972 has 24 divisors (see below), whose sum is σ = 11566800. Its totient is φ = 3137600.

The previous prime is 6440969. The next prime is 6440983. The reversal of 6440972 is 2790446.

It is a super-2 number, since 2×6440972² = 82972240609568, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43154 + ... + 43302.

It is an arithmetic number, because the mean of its divisors is an integer number (481950).

Almost surely, 2^6440972 is an apocalyptic number.

It is an amenable number.

6440972 is a deficient number, since it is larger than the sum of its proper divisors (5125828).

6440972 is a wasteful number, since it uses less digits than its factorization.

6440972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 6440972 is about 2537.9070116929. The cubic root of 6440972 is about 186.0589091550.

The spelling of 6440972 in words is "six million, four hundred forty thousand, nine hundred seventy-two".