40725531 has 64 divisors (see below), whose sum is σ = 79257600. Its totient is φ = 20023200.

The previous prime is 40725521. The next prime is 40725533. The reversal of 40725531 is 13552704.

It is a happy number.

40725531 is a `hidden beast` number, since 40 + 72 + 553 + 1 = 666.

It is not a de Polignac number, because 40725531 - 2⁵ = 40725499 is a prime.

It is a super-2 number, since 2×40725531² = 3317137750463922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) 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 (27).

It is a junction number, because it is equal to n+sod(n) for n = 40725495 and 40725504.

It is not an unprimeable number, because it can be changed into a prime (40725533) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 38986 + ... + 40016.

It is an arithmetic number, because the mean of its divisors is an integer number (1238400).

Almost surely, 2^40725531 is an apocalyptic number.

40725531 is a deficient number, since it is larger than the sum of its proper divisors (38532069).

40725531 is a wasteful number, since it uses less digits than its factorization.

40725531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077 (or 1071 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 40725531 is about 6381.6558196130. The cubic root of 40725531 is about 344.0505463628.

The spelling of 40725531 in words is "forty million, seven hundred twenty-five thousand, five hundred thirty-one".