40643645 has 32 divisors (see below), whose sum is σ = 60203520. Its totient is φ = 25724160.

The previous prime is 40643639. The next prime is 40643663. The reversal of 40643645 is 54634604.

40643645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40643645 - 2¹⁸ = 40381501 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 22475 + ... + 24215.

It is an arithmetic number, because the mean of its divisors is an integer number (1881360).

Almost surely, 2^40643645 is an apocalyptic number.

It is an amenable number.

40643645 is a deficient number, since it is larger than the sum of its proper divisors (19559875).

40643645 is a wasteful number, since it uses less digits than its factorization.

40643645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1805.

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 40643645 is about 6375.2368583450. The cubic root of 40643645 is about 343.8197998204.

The spelling of 40643645 in words is "forty million, six hundred forty-three thousand, six hundred forty-five".