634985 has 8 divisors (see below), whose sum is σ = 820680. Its totient is φ = 468864.

The previous prime is 634979. The next prime is 635003. The reversal of 634985 is 589436.

It can be written as a sum of positive squares in 4 ways, for example, as 1369 + 633616 = 37^2 + 796^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 634985 - 2⁴ = 634969 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4820 + ... + 4949.

It is an arithmetic number, because the mean of its divisors is an integer number (102585).

2⁶³⁴⁹⁸⁵ is an apocalyptic number.

634985 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

634985 is a deficient number, since it is larger than the sum of its proper divisors (185695).

634985 is a wasteful number, since it uses less digits than its factorization.

634985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9787.

The product of its digits is 25920, while the sum is 35.

The square root of 634985 is about 796.8594606328. The cubic root of 634985 is about 85.9517035477.

The spelling of 634985 in words is "six hundred thirty-four thousand, nine hundred eighty-five".