6440406172 has 12 divisors (see below), whose sum is σ = 11324127976. Its totient is φ = 3204941040.

The previous prime is 6440406143. The next prime is 6440406173. The reversal of 6440406172 is 2716040446.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440406173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3814563 + ... + 3816250.

Almost surely, 2^6440406172 is an apocalyptic number.

It is an amenable number.

6440406172 is a deficient number, since it is larger than the sum of its proper divisors (4883721804).

6440406172 is a wasteful number, since it uses less digits than its factorization.

6440406172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7631028 (or 7631026 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 6440406172 is about 80252.1412300008. The cubic root of 6440406172 is about 1860.5346068003.

The spelling of 6440406172 in words is "six billion, four hundred forty million, four hundred six thousand, one hundred seventy-two".