635944 has 8 divisors (see below), whose sum is σ = 1192410. Its totient is φ = 317968.

The previous prime is 635939. The next prime is 635959. The reversal of 635944 is 449536.

It can be written as a sum of positive squares in only one way, i.e., 422500 + 213444 = 650^2 + 462^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×635944² = 808849542272, which contains 22 as substring.

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39739 + ... + 39754.

2⁶³⁵⁹⁴⁴ is an apocalyptic number.

It is an amenable number.

635944 is a deficient number, since it is larger than the sum of its proper divisors (556466).

635944 is a wasteful number, since it uses less digits than its factorization.

635944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79499 (or 79495 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 635944 is about 797.4609708318. The cubic root of 635944 is about 85.9949519301.

The spelling of 635944 in words is "six hundred thirty-five thousand, nine hundred forty-four".