636938 has 8 divisors (see below), whose sum is σ = 961632. Its totient is φ = 316396.

The previous prime is 636931. The next prime is 636947. The reversal of 636938 is 839636.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 636898 and 636907.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 636938.

It is not an unprimeable number, because it can be changed into a prime (636931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620 + ... + 1287.

It is an arithmetic number, because the mean of its divisors is an integer number (120204).

2⁶³⁶⁹³⁸ is an apocalyptic number.

636938 is a deficient number, since it is larger than the sum of its proper divisors (324694).

636938 is a wasteful number, since it uses less digits than its factorization.

636938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2076.

The product of its digits is 23328, while the sum is 35.

The square root of 636938 is about 798.0839554834. The cubic root of 636938 is about 86.0397328571.

The spelling of 636938 in words is "six hundred thirty-six thousand, nine hundred thirty-eight".