40320725 has 12 divisors (see below), whose sum is σ = 52172256. Its totient is φ = 30853680.

The previous prime is 40320691. The next prime is 40320733. The reversal of 40320725 is 52702304.

It is not a de Polignac number, because 40320725 - 2⁶ = 40320661 is a prime.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40320725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34487 + ... + 35636.

It is an arithmetic number, because the mean of its divisors is an integer number (4347688).

Almost surely, 2^40320725 is an apocalyptic number.

It is an amenable number.

40320725 is a deficient number, since it is larger than the sum of its proper divisors (11851531).

40320725 is a wasteful number, since it uses less digits than its factorization.

40320725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70156 (or 70151 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 40320725 is about 6349.8602346823. The cubic root of 40320725 is about 342.9068105543.

The spelling of 40320725 in words is "forty million, three hundred twenty thousand, seven hundred twenty-five".