634240 has 32 divisors (see below), whose sum is σ = 1517760. Its totient is φ = 253440.

The previous prime is 634237. The next prime is 634241. The reversal of 634240 is 42436.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634241) 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, 145 + ... + 1135.

It is an arithmetic number, because the mean of its divisors is an integer number (47430).

2⁶³⁴²⁴⁰ 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 634240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (758880).

634240 is an abundant number, since it is smaller than the sum of its proper divisors (883520).

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

634240 is an equidigital number, since it uses as much as digits as its factorization.

634240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010 (or 998 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 634240 is about 796.3918633437. The cubic root of 634240 is about 85.9180759406.

Adding to 634240 its reverse (42436), we get a palindrome (676676).

The spelling of 634240 in words is "six hundred thirty-four thousand, two hundred forty".