636812 has 24 divisors (see below), whose sum is σ = 1248912. Its totient is φ = 281600.

The previous prime is 636809. The next prime is 636817. The reversal of 636812 is 218636.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 636812.

It is not an unprimeable number, because it can be changed into a prime (636817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1628 + ... + 1980.

It is an arithmetic number, because the mean of its divisors is an integer number (52038).

2⁶³⁶⁸¹² is an apocalyptic number.

It is an amenable number.

636812 is a deficient number, since it is larger than the sum of its proper divisors (612100).

636812 is a wasteful number, since it uses less digits than its factorization.

636812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409 (or 407 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 636812 is about 798.0050125156. The cubic root of 636812 is about 86.0340589813.

The spelling of 636812 in words is "six hundred thirty-six thousand, eight hundred twelve".