634641 has 16 divisors (see below), whose sum is σ = 989184. Its totient is φ = 354384.

The previous prime is 634609. The next prime is 634643. The reversal of 634641 is 146436.

634641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 634641 - 2⁵ = 634609 is a prime.

It is a Curzon number.

634641 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (634643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 666 + ... + 1308.

It is an arithmetic number, because the mean of its divisors is an integer number (61824).

2⁶³⁴⁶⁴¹ is an apocalyptic number.

It is an amenable number.

634641 is a deficient number, since it is larger than the sum of its proper divisors (354543).

634641 is a wasteful number, since it uses less digits than its factorization.

634641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700.

The product of its digits is 1728, while the sum is 24.

The square root of 634641 is about 796.6435840450. The cubic root of 634641 is about 85.9361794398.

It can be divided in two parts, 634 and 641, that added together give a triangular number (1275 = T₅₀).

The spelling of 634641 in words is "six hundred thirty-four thousand, six hundred forty-one".