40252257 has 24 divisors (see below), whose sum is σ = 60787584. Its totient is φ = 25641504.

The previous prime is 40252213. The next prime is 40252307. The reversal of 40252257 is 75225204.

40252257 is a `hidden beast` number, since 402 + 5 + 2 + 257 = 666.

It is not a de Polignac number, because 40252257 - 2⁷ = 40252129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40252257.

It is not an unprimeable number, because it can be changed into a prime (40252657) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17083 + ... + 19295.

It is an arithmetic number, because the mean of its divisors is an integer number (2532816).

Almost surely, 2^40252257 is an apocalyptic number.

40252257 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

It is an amenable number.

40252257 is a deficient number, since it is larger than the sum of its proper divisors (20535327).

40252257 is a wasteful number, since it uses less digits than its factorization.

40252257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2309 (or 2306 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 40252257 is about 6344.4666442499. The cubic root of 40252257 is about 342.7126056687.

The spelling of 40252257 in words is "forty million, two hundred fifty-two thousand, two hundred fifty-seven".