40255785 has 20 divisors (see below), whose sum is σ = 72162948. Its totient is φ = 21469536.

The previous prime is 40255781. The next prime is 40255801. The reversal of 40255785 is 58755204.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16548624 + 23707161 = 4068^2 + 4869^2 .

It is not a de Polignac number, because 40255785 - 2² = 40255781 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40255781) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 49294 + ... + 50103.

Almost surely, 2^40255785 is an apocalyptic number.

40255785 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40255785 is a deficient number, since it is larger than the sum of its proper divisors (31907163).

40255785 is an equidigital number, since it uses as much as digits as its factorization.

40255785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99414 (or 99405 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 36.

The square root of 40255785 is about 6344.7446757139. The cubic root of 40255785 is about 342.7226179831.

The spelling of 40255785 in words is "forty million, two hundred fifty-five thousand, seven hundred eighty-five".