635855 has 12 divisors (see below), whose sum is σ = 839496. Its totient is φ = 462000.

The previous prime is 635849. The next prime is 635867. The reversal of 635855 is 558536.

It is not a de Polignac number, because 635855 - 2⁸ = 635599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80 + ... + 1130.

It is an arithmetic number, because the mean of its divisors is an integer number (69958).

2⁶³⁵⁸⁵⁵ is an apocalyptic number.

635855 is a deficient number, since it is larger than the sum of its proper divisors (203641).

635855 is a wasteful number, since it uses less digits than its factorization.

635855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078 (or 1067 counting only the distinct ones).

The product of its digits is 18000, while the sum is 32.

The square root of 635855 is about 797.4051667753. The cubic root of 635855 is about 85.9909400948.

The spelling of 635855 in words is "six hundred thirty-five thousand, eight hundred fifty-five".