634189 has 4 divisors (see below), whose sum is σ = 640224. Its totient is φ = 628156.

The previous prime is 634187. The next prime is 634199. The reversal of 634189 is 981436.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 634189 - 2¹ = 634187 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is a Duffinian number.

634189 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 634189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634181) 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 3 ways as a sum of consecutive naturals, for example, 2857 + ... + 3070.

It is an arithmetic number, because the mean of its divisors is an integer number (160056).

2⁶³⁴¹⁸⁹ is an apocalyptic number.

It is an amenable number.

634189 is a deficient number, since it is larger than the sum of its proper divisors (6035).

634189 is a wasteful number, since it uses less digits than its factorization.

634189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6034.

The product of its digits is 5184, while the sum is 31.

The square root of 634189 is about 796.3598432869. The cubic root of 634189 is about 85.9157729536.

The spelling of 634189 in words is "six hundred thirty-four thousand, one hundred eighty-nine".