18634289 has 4 divisors (see below), whose sum is σ = 18662256. Its totient is φ = 18606324.

The previous prime is 18634279. The next prime is 18634309. The reversal of 18634289 is 98243681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18634289 - 2²⁰ = 17585713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18634229) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 12959 + ... + 14324.

It is an arithmetic number, because the mean of its divisors is an integer number (4665564).

Almost surely, 2^18634289 is an apocalyptic number.

It is an amenable number.

18634289 is a deficient number, since it is larger than the sum of its proper divisors (27967).

18634289 is an equidigital number, since it uses as much as digits as its factorization.

18634289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27966.

The product of its digits is 82944, while the sum is 41.

The square root of 18634289 is about 4316.7451859011. The cubic root of 18634289 is about 265.1170196368.

The spelling of 18634289 in words is "eighteen million, six hundred thirty-four thousand, two hundred eighty-nine".