18609689 has 8 divisors (see below), whose sum is σ = 21349440. Its totient is φ = 15890256.

The previous prime is 18609673. The next prime is 18609707. The reversal of 18609689 is 98690681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18609689 - 2⁴ = 18609673 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18609289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3059 + ... + 6824.

It is an arithmetic number, because the mean of its divisors is an integer number (2668680).

Almost surely, 2^18609689 is an apocalyptic number.

It is an amenable number.

18609689 is a deficient number, since it is larger than the sum of its proper divisors (2739751).

18609689 is an equidigital number, since it uses as much as digits as its factorization.

18609689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10159.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 18609689 is about 4313.8948758633. The cubic root of 18609689 is about 265.0003037851. Note that the first 3 decimals are identical.

The spelling of 18609689 in words is "eighteen million, six hundred nine thousand, six hundred eighty-nine".