40045618 has 16 divisors (see below), whose sum is σ = 62250840. Its totient is φ = 19305216.

The previous prime is 40045589. The next prime is 40045631. The reversal of 40045618 is 81654004.

It can be written as a sum of positive squares in 4 ways, for example, as 21409129 + 18636489 = 4627^2 + 4317^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5968 + ... + 10756.

Almost surely, 2^40045618 is an apocalyptic number.

40045618 is a deficient number, since it is larger than the sum of its proper divisors (22205222).

40045618 is a wasteful number, since it uses less digits than its factorization.

40045618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4941.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 40045618 is about 6328.1607122449. The cubic root of 40045618 is about 342.1251494148.

The spelling of 40045618 in words is "forty million, forty-five thousand, six hundred eighteen".