636986 has 16 divisors (see below), whose sum is σ = 1102464. Its totient is φ = 270384.

The previous prime is 636983. The next prime is 636997. The reversal of 636986 is 689636.

It is a happy number.

636986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (636983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2291 + ... + 2553.

It is an arithmetic number, because the mean of its divisors is an integer number (68904).

2⁶³⁶⁹⁸⁶ is an apocalyptic number.

636986 is a deficient number, since it is larger than the sum of its proper divisors (465478).

636986 is a wasteful number, since it uses less digits than its factorization.

636986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445.

The product of its digits is 46656, while the sum is 38.

The square root of 636986 is about 798.1140269410. The cubic root of 636986 is about 86.0418941367.

Subtracting 636986 from its reverse (689636), we obtain a triangular number (52650 = T₃₂₄).

The spelling of 636986 in words is "six hundred thirty-six thousand, nine hundred eighty-six".