634340 has 48 divisors (see below), whose sum is σ = 1596672. Its totient is φ = 206976.

The previous prime is 634331. The next prime is 634343. The reversal of 634340 is 43436.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a d-powerful number, because it can be written as 6⁴ + 3⁹ + 3¹² + 4⁷ + 4⁸ + 0 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634343) by changing a digit.

634340 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 15 ways as a sum of consecutive naturals, for example, 3122 + ... + 3318.

It is an arithmetic number, because the mean of its divisors is an integer number (33264).

2⁶³⁴³⁴⁰ 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 634340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (798336).

634340 is an abundant number, since it is smaller than the sum of its proper divisors (962332).

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

634340 is a wasteful number, since it uses less digits than its factorization.

634340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 634340 is about 796.4546440319. The cubic root of 634340 is about 85.9225912429.

Adding to 634340 its reverse (43436), we get a palindrome (677776).

The spelling of 634340 in words is "six hundred thirty-four thousand, three hundred forty".