634659 has 8 divisors (see below), whose sum is σ = 856080. Its totient is φ = 418176.

The previous prime is 634651. The next prime is 634679. The reversal of 634659 is 956436.

It is a happy number.

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

It is not a de Polignac number, because 634659 - 2³ = 634651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (634651) 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, 922 + ... + 1455.

It is an arithmetic number, because the mean of its divisors is an integer number (107010).

2⁶³⁴⁶⁵⁹ is an apocalyptic number.

634659 is a deficient number, since it is larger than the sum of its proper divisors (221421).

634659 is a wasteful number, since it uses less digits than its factorization.

634659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2469.

The product of its digits is 19440, while the sum is 33.

The square root of 634659 is about 796.6548813633. The cubic root of 634659 is about 85.9369918868.

The spelling of 634659 in words is "six hundred thirty-four thousand, six hundred fifty-nine".