40008644 has 24 divisors (see below), whose sum is σ = 75602688. Its totient is φ = 18416160.

The previous prime is 40008643. The next prime is 40008649. The reversal of 40008644 is 44680004.

40008644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (40008643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24749 + ... + 26315.

It is an arithmetic number, because the mean of its divisors is an integer number (3150112).

Almost surely, 2^40008644 is an apocalyptic number.

It is an amenable number.

40008644 is a deficient number, since it is larger than the sum of its proper divisors (35594044).

40008644 is a wasteful number, since it uses less digits than its factorization.

40008644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2075 (or 2073 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 40008644 is about 6325.2386516241. The cubic root of 40008644 is about 342.0198226145.

Adding to 40008644 its reverse (44680004), we get a palindrome (84688648).

The spelling of 40008644 in words is "forty million, eight thousand, six hundred forty-four".