18630689 has 16 divisors (see below), whose sum is σ = 23417856. Its totient is φ = 14398800.

The previous prime is 18630683. The next prime is 18630709. The reversal of 18630689 is 98603681.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18630689 - 2¹⁶ = 18565153 is a prime.

It is a super-2 number, since 2×18630689² = 694205145229442, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18630683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9164 + ... + 11010.

It is an arithmetic number, because the mean of its divisors is an integer number (1463616).

Almost surely, 2^18630689 is an apocalyptic number.

It is an amenable number.

18630689 is a deficient number, since it is larger than the sum of its proper divisors (4787167).

18630689 is a wasteful number, since it uses less digits than its factorization.

18630689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 18630689 is about 4316.3281849276. The cubic root of 18630689 is about 265.0999456871.

The spelling of 18630689 in words is "eighteen million, six hundred thirty thousand, six hundred eighty-nine".