634518 has 12 divisors (see below), whose sum is σ = 1374828. Its totient is φ = 211500.

The previous prime is 634511. The next prime is 634519. The reversal of 634518 is 815436.

It is a super-2 number, since 2×634518² = 805226184648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 634491 and 634500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634511) 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 5 ways as a sum of consecutive naturals, for example, 17608 + ... + 17643.

It is an arithmetic number, because the mean of its divisors is an integer number (114569).

2⁶³⁴⁵¹⁸ is an apocalyptic number.

634518 is an abundant number, since it is smaller than the sum of its proper divisors (740310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

634518 is a wasteful number, since it uses less digits than its factorization.

634518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35259 (or 35256 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 634518 is about 796.5663814146. The cubic root of 634518 is about 85.9306273071.

The spelling of 634518 in words is "six hundred thirty-four thousand, five hundred eighteen".