40644004 has 12 divisors (see below), whose sum is σ = 72469404. Its totient is φ = 19938464.

The previous prime is 40644001. The next prime is 40644031. The reversal of 40644004 is 40044604.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 22581504 + 18062500 = 4752^2 + 4250^2 .

It is a super-2 number, since 2×40644004² = 3303870122304032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40644001) 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, 95647 + ... + 96070.

It is an arithmetic number, because the mean of its divisors is an integer number (6039117).

Almost surely, 2^40644004 is an apocalyptic number.

It is an amenable number.

40644004 is a deficient number, since it is larger than the sum of its proper divisors (31825400).

40644004 is a wasteful number, since it uses less digits than its factorization.

40644004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191774 (or 191772 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 40644004 is about 6375.2650140994. The cubic root of 40644004 is about 343.8208121225.

Adding to 40644004 its reverse (40044604), we get a palindrome (80688608).

The spelling of 40644004 in words is "forty million, six hundred forty-four thousand, four".