636942 has 16 divisors (see below), whose sum is σ = 1290240. Its totient is φ = 209592.

The previous prime is 636931. The next prime is 636947. The reversal of 636942 is 249636.

It is a super-2 number, since 2×636942² = 811390222728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636947) 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, 142 + ... + 1137.

It is an arithmetic number, because the mean of its divisors is an integer number (80640).

2⁶³⁶⁹⁴² is an apocalyptic number.

636942 is an abundant number, since it is smaller than the sum of its proper divisors (653298).

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

636942 is a wasteful number, since it uses less digits than its factorization.

636942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1367.

The product of its digits is 7776, while the sum is 30.

The square root of 636942 is about 798.0864614815. The cubic root of 636942 is about 86.0399129679.

The spelling of 636942 in words is "six hundred thirty-six thousand, nine hundred forty-two".