634993 has 4 divisors (see below), whose sum is σ = 647028. Its totient is φ = 622960.

The previous prime is 634979. The next prime is 635003. The reversal of 634993 is 399436.

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

It can be written as a sum of positive squares in 2 ways, for example, as 552049 + 82944 = 743^2 + 288^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634993 is a prime.

It is a super-2 number, since 2×634993² = 806432220098, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634903) 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, 5938 + ... + 6043.

It is an arithmetic number, because the mean of its divisors is an integer number (161757).

2⁶³⁴⁹⁹³ is an apocalyptic number.

It is an amenable number.

634993 is a deficient number, since it is larger than the sum of its proper divisors (12035).

634993 is a wasteful number, since it uses less digits than its factorization.

634993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12034.

The product of its digits is 17496, while the sum is 34.

The square root of 634993 is about 796.8644803227. The cubic root of 634993 is about 85.9520645067.

The spelling of 634993 in words is "six hundred thirty-four thousand, nine hundred ninety-three".