634789 has 4 divisors (see below), whose sum is σ = 641056. Its totient is φ = 628524.

The previous prime is 634759. The next prime is 634793. The reversal of 634789 is 987436.

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 634789 - 2⁵ = 634757 is a prime.

It is a super-3 number, since 3×634789³ = 767378155134333207, which contains 333 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2979 + ... + 3184.

It is an arithmetic number, because the mean of its divisors is an integer number (160264).

2⁶³⁴⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

634789 is a deficient number, since it is larger than the sum of its proper divisors (6267).

634789 is a wasteful number, since it uses less digits than its factorization.

634789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6266.

The product of its digits is 36288, while the sum is 37.

The square root of 634789 is about 796.7364683507. The cubic root of 634789 is about 85.9428591038.

The spelling of 634789 in words is "six hundred thirty-four thousand, seven hundred eighty-nine".