634918 has 4 divisors (see below), whose sum is σ = 952380. Its totient is φ = 317458.

The previous prime is 634903. The next prime is 634927. The reversal of 634918 is 819436.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 634918.

It is a congruent number.

It is an unprimeable number.

634918 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 as a sum of consecutive naturals, namely, 158728 + ... + 158731.

It is an arithmetic number, because the mean of its divisors is an integer number (238095).

2⁶³⁴⁹¹⁸ is an apocalyptic number.

634918 is a deficient number, since it is larger than the sum of its proper divisors (317462).

634918 is a wasteful number, since it uses less digits than its factorization.

634918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317461.

The product of its digits is 5184, while the sum is 31.

The square root of 634918 is about 796.8174194883. The cubic root of 634918 is about 85.9486803966.

The spelling of 634918 in words is "six hundred thirty-four thousand, nine hundred eighteen".