636946 has 4 divisors (see below), whose sum is σ = 955422. Its totient is φ = 318472.

The previous prime is 636931. The next prime is 636947. The reversal of 636946 is 649636.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 540225 + 96721 = 735^2 + 311^2 .

It is an Ulam 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 as a sum of consecutive naturals, namely, 159235 + ... + 159238.

2⁶³⁶⁹⁴⁶ is an apocalyptic number.

636946 is a deficient number, since it is larger than the sum of its proper divisors (318476).

636946 is a wasteful number, since it uses less digits than its factorization.

636946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318475.

The product of its digits is 23328, while the sum is 34.

The square root of 636946 is about 798.0889674717. The cubic root of 636946 is about 86.0400930779.

The spelling of 636946 in words is "six hundred thirty-six thousand, nine hundred forty-six".