636039 has 8 divisors (see below), whose sum is σ = 942320. Its totient is φ = 424008.

The previous prime is 636023. The next prime is 636043. The reversal of 636039 is 930636.

636039 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 636039 - 2⁴ = 636023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 23557 = 636039 / (6 + 3 + 6 + 0 + 3 + 9).

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636059) 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, 11752 + ... + 11805.

It is an arithmetic number, because the mean of its divisors is an integer number (117790).

2⁶³⁶⁰³⁹ is an apocalyptic number.

636039 is a deficient number, since it is larger than the sum of its proper divisors (306281).

636039 is a wasteful number, since it uses less digits than its factorization.

636039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23566 (or 23560 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

The square root of 636039 is about 797.5205326510. The cubic root of 636039 is about 85.9992338133. Note that the first 3 decimals are identical.

The spelling of 636039 in words is "six hundred thirty-six thousand, thirty-nine".