40320387 has 6 divisors (see below), whose sum is σ = 58240572. Its totient is φ = 26880252.

The previous prime is 40320377. The next prime is 40320391. The reversal of 40320387 is 78302304.

It is not a de Polignac number, because 40320387 - 2⁶ = 40320323 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40320387.

It is not an unprimeable number, because it can be changed into a prime (40320307) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2240013 + ... + 2240030.

It is an arithmetic number, because the mean of its divisors is an integer number (9706762).

Almost surely, 2^40320387 is an apocalyptic number.

40320387 is a deficient number, since it is larger than the sum of its proper divisors (17920185).

40320387 is a wasteful number, since it uses less digits than its factorization.

40320387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4480049 (or 4480046 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 40320387 is about 6349.8336198675. The cubic root of 40320387 is about 342.9058523801.

The spelling of 40320387 in words is "forty million, three hundred twenty thousand, three hundred eighty-seven".