634605 has 8 divisors (see below), whose sum is σ = 1015392. Its totient is φ = 338448.

The previous prime is 634603. The next prime is 634609. The reversal of 634605 is 506436.

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

It is not a de Polignac number, because 634605 - 2¹ = 634603 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

634605 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634603) 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 7 ways as a sum of consecutive naturals, for example, 21139 + ... + 21168.

It is an arithmetic number, because the mean of its divisors is an integer number (126924).

2⁶³⁴⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

634605 is a deficient number, since it is larger than the sum of its proper divisors (380787).

634605 is a wasteful number, since it uses less digits than its factorization.

634605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42315.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 634605 is about 796.6209889276. The cubic root of 634605 is about 85.9345544996.

The spelling of 634605 in words is "six hundred thirty-four thousand, six hundred five".