634140 has 72 divisors (see below), whose sum is σ = 2079168. Its totient is φ = 155520.

The previous prime is 634103. The next prime is 634141. The reversal of 634140 is 41436.

634140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634141) by changing a digit.

634140 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 23 ways as a sum of consecutive naturals, for example, 2205 + ... + 2475.

2⁶³⁴¹⁴⁰ is an apocalyptic number.

634140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 634140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1039584).

634140 is an abundant number, since it is smaller than the sum of its proper divisors (1445028).

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

634140 is a wasteful number, since it uses less digits than its factorization.

634140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 634140 is about 796.3290777059. The cubic root of 634140 is about 85.9135601636.

Adding to 634140 its reverse (41436), we get a palindrome (675576).

Subtracting from 634140 its reverse (41436), we obtain a cube (592704 = 84³).

The spelling of 634140 in words is "six hundred thirty-four thousand, one hundred forty".