40644872 has 16 divisors (see below), whose sum is σ = 76554240. Its totient is φ = 20230416.

The previous prime is 40644869. The next prime is 40644881. The reversal of 40644872 is 27844604.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9608 + ... + 13175.

It is an arithmetic number, because the mean of its divisors is an integer number (4784640).

Almost surely, 2^40644872 is an apocalyptic number.

It is an amenable number.

40644872 is a deficient number, since it is larger than the sum of its proper divisors (35909368).

40644872 is a wasteful number, since it uses less digits than its factorization.

40644872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23012 (or 23008 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 35.

The square root of 40644872 is about 6375.3330893374. Note that the first 3 decimals coincide. The cubic root of 40644872 is about 343.8232596696.

The spelling of 40644872 in words is "forty million, six hundred forty-four thousand, eight hundred seventy-two".