635859 has 12 divisors (see below), whose sum is σ = 1049776. Its totient is φ = 363312.

The previous prime is 635849. The next prime is 635867. The reversal of 635859 is 958536.

It is not a de Polignac number, because 635859 - 2⁷ = 635731 is a prime.

635859 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (635809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4984 + ... + 5109.

2⁶³⁵⁸⁵⁹ is an apocalyptic number.

635859 is a deficient number, since it is larger than the sum of its proper divisors (413917).

635859 is a wasteful number, since it uses less digits than its factorization.

635859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10106 (or 10103 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 635859 is about 797.4076749066. The cubic root of 635859 is about 85.9911204100.

The spelling of 635859 in words is "six hundred thirty-five thousand, eight hundred fifty-nine".