634356 has 36 divisors (see below), whose sum is σ = 1633632. Its totient is φ = 207504.

The previous prime is 634343. The next prime is 634367. The reversal of 634356 is 653436.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

634356 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2281 + ... + 2543.

2⁶³⁴³⁵⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 634356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (816816).

634356 is an abundant number, since it is smaller than the sum of its proper divisors (999276).

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

634356 is a wasteful number, since it uses less digits than its factorization.

634356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 335 counting only the distinct ones).

The product of its digits is 6480, while the sum is 27.

The square root of 634356 is about 796.4646884828. The cubic root of 634356 is about 85.9233136473.

It can be divided in two parts, 634 and 356, that added together give a triangular number (990 = T₄₄).

The spelling of 634356 in words is "six hundred thirty-four thousand, three hundred fifty-six".