636402117 has 24 divisors (see below), whose sum is σ = 930518400. Its totient is φ = 386650368.

The previous prime is 636402103. The next prime is 636402119. The reversal of 636402117 is 711204636.

It is not a de Polignac number, because 636402117 - 2²³ = 628013509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636402119) 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, 32109 + ... + 47997.

It is an arithmetic number, because the mean of its divisors is an integer number (38771600).

Almost surely, 2^636402117 is an apocalyptic number.

It is an amenable number.

636402117 is a deficient number, since it is larger than the sum of its proper divisors (294116283).

636402117 is a wasteful number, since it uses less digits than its factorization.

636402117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15997 (or 15984 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 636402117 is about 25227.0116541774. The cubic root of 636402117 is about 860.1559645925.

It can be divided in two parts, 636 and 402117, that added together give a triangular number (402753 = T₈₉₇).

The spelling of 636402117 in words is "six hundred thirty-six million, four hundred two thousand, one hundred seventeen".