18000634 has 4 divisors (see below), whose sum is σ = 27000954. Its totient is φ = 9000316.

The previous prime is 18000629. The next prime is 18000643. The reversal of 18000634 is 43600081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43600081 = 7 ⋅6228583.

It can be written as a sum of positive squares in only one way, i.e., 14402025 + 3598609 = 3795^2 + 1897^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4500157 + ... + 4500160.

Almost surely, 2^18000634 is an apocalyptic number.

18000634 is a deficient number, since it is larger than the sum of its proper divisors (9000320).

18000634 is an equidigital number, since it uses as much as digits as its factorization.

18000634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9000319.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 18000634 is about 4242.7154040779. The cubic root of 18000634 is about 262.0772163293.

The spelling of 18000634 in words is "eighteen million, six hundred thirty-four", and thus it is an aban number.