635391 has 16 divisors (see below), whose sum is σ = 954720. Its totient is φ = 417600.

The previous prime is 635389. The next prime is 635413. The reversal of 635391 is 193536.

635391 is nontrivially palindromic in base 5.

It is not a de Polignac number, because 635391 - 2¹ = 635389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2611 + ... + 2843.

It is an arithmetic number, because the mean of its divisors is an integer number (59670).

2⁶³⁵³⁹¹ is an apocalyptic number.

635391 is a deficient number, since it is larger than the sum of its proper divisors (319329).

635391 is a wasteful number, since it uses less digits than its factorization.

635391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343 (or 337 counting only the distinct ones).

The product of its digits is 2430, while the sum is 27.

The square root of 635391 is about 797.1141699907. The cubic root of 635391 is about 85.9700183933.

The spelling of 635391 in words is "six hundred thirty-five thousand, three hundred ninety-one".