634705 has 8 divisors (see below), whose sum is σ = 774504. Its totient is φ = 499200.

The previous prime is 634703. The next prime is 634709. The reversal of 634705 is 507436.

It can be written as a sum of positive squares in 4 ways, for example, as 1089 + 633616 = 33^2 + 796^2 .

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

It is not a de Polignac number, because 634705 - 2¹ = 634703 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 634705.

It is not an unprimeable number, because it can be changed into a prime (634703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736 + ... + 1345.

It is an arithmetic number, because the mean of its divisors is an integer number (96813).

2⁶³⁴⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

634705 is a deficient number, since it is larger than the sum of its proper divisors (139799).

634705 is a wasteful number, since it uses less digits than its factorization.

634705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2147.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 634705 is about 796.6837515602. The cubic root of 634705 is about 85.9390680706.

The spelling of 634705 in words is "six hundred thirty-four thousand, seven hundred five".