636387 has 12 divisors (see below), whose sum is σ = 889224. Its totient is φ = 404800.

The previous prime is 636359. The next prime is 636403. The reversal of 636387 is 783636.

It is a happy number.

It is not a de Polignac number, because 636387 - 2¹⁰ = 635363 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (636287) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1387 + ... + 1787.

It is an arithmetic number, because the mean of its divisors is an integer number (74102).

2⁶³⁶³⁸⁷ is an apocalyptic number.

636387 is a deficient number, since it is larger than the sum of its proper divisors (252837).

636387 is a wasteful number, since it uses less digits than its factorization.

636387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450 (or 427 counting only the distinct ones).

The product of its digits is 18144, while the sum is 33.

The square root of 636387 is about 797.7386790171. The cubic root of 636387 is about 86.0149153867.

The spelling of 636387 in words is "six hundred thirty-six thousand, three hundred eighty-seven".