40251636 has 18 divisors (see below), whose sum is σ = 101747282. Its totient is φ = 13417200.

The previous prime is 40251619. The next prime is 40251637. The reversal of 40251636 is 63615204.

40251636 is a `hidden beast` number, since 4 + 0 + 25 + 1 + 636 = 666.

It can be written as a sum of positive squares in only one way, i.e., 27248400 + 13003236 = 5220^2 + 3606^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40251637) 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, 559015 + ... + 559086.

Almost surely, 2^40251636 is an apocalyptic number.

It is an amenable number.

40251636 is an abundant number, since it is smaller than the sum of its proper divisors (61495646).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40251636 is a wasteful number, since it uses less digits than its factorization.

40251636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118111 (or 1118106 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 40251636 is about 6344.4177037771. The cubic root of 40251636 is about 342.7108432365.

The spelling of 40251636 in words is "forty million, two hundred fifty-one thousand, six hundred thirty-six".