634809 has 32 divisors (see below), whose sum is σ = 1070080. Its totient is φ = 326592.

The previous prime is 634807. The next prime is 634817. The reversal of 634809 is 908436.

It is not a de Polignac number, because 634809 - 2¹ = 634807 is a prime.

634809 is an undulating number in base 11.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 634809.

It is not an unprimeable number, because it can be changed into a prime (634807) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 14742 + ... + 14784.

It is an arithmetic number, because the mean of its divisors is an integer number (33440).

2⁶³⁴⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

634809 is a deficient number, since it is larger than the sum of its proper divisors (435271).

634809 is a wasteful number, since it uses less digits than its factorization.

634809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 634809 is about 796.7490194534. The cubic root of 634809 is about 85.9437616815.

The spelling of 634809 in words is "six hundred thirty-four thousand, eight hundred nine".