636943 has 4 divisors (see below), whose sum is σ = 638848. Its totient is φ = 635040.

The previous prime is 636931. The next prime is 636947. The reversal of 636943 is 349636.

636943 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 636943 - 2¹⁷ = 505871 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 303 + ... + 1168.

It is an arithmetic number, because the mean of its divisors is an integer number (159712).

2⁶³⁶⁹⁴³ is an apocalyptic number.

636943 is a deficient number, since it is larger than the sum of its proper divisors (1905).

636943 is a wasteful number, since it uses less digits than its factorization.

636943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904.

The product of its digits is 11664, while the sum is 31.

The square root of 636943 is about 798.0870879798. The cubic root of 636943 is about 86.0399579954.

The spelling of 636943 in words is "six hundred thirty-six thousand, nine hundred forty-three".