40645665 has 16 divisors (see below), whose sum is σ = 72259200. Its totient is φ = 21677616.

The previous prime is 40645663. The next prime is 40645711. The reversal of 40645665 is 56654604.

It is a happy number.

40645665 is a `hidden beast` number, since 4 + 0 + 645 + 6 + 6 + 5 = 666.

It is not a de Polignac number, because 40645665 - 2¹ = 40645663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40645663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150405 + ... + 150674.

It is an arithmetic number, because the mean of its divisors is an integer number (4516200).

Almost surely, 2^40645665 is an apocalyptic number.

40645665 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40645665 is a deficient number, since it is larger than the sum of its proper divisors (31613535).

40645665 is a wasteful number, since it uses less digits than its factorization.

40645665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301093 (or 301087 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 40645665 is about 6375.3952818629. The cubic root of 40645665 is about 343.8254957046.

The spelling of 40645665 in words is "forty million, six hundred forty-five thousand, six hundred sixty-five".