18665489 has 8 divisors (see below), whose sum is σ = 19593792. Its totient is φ = 17746960.

The previous prime is 18665461. The next prime is 18665509. The reversal of 18665489 is 98456681.

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 18665489 - 2¹⁶ = 18599953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18665459) 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, 1634 + ... + 6324.

It is an arithmetic number, because the mean of its divisors is an integer number (2449224).

Almost surely, 2^18665489 is an apocalyptic number.

It is an amenable number.

18665489 is a deficient number, since it is larger than the sum of its proper divisors (928303).

18665489 is a wasteful number, since it uses less digits than its factorization.

18665489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4887.

The product of its digits is 414720, while the sum is 47.

The square root of 18665489 is about 4320.3575083551. The cubic root of 18665489 is about 265.2649018341.

The spelling of 18665489 in words is "eighteen million, six hundred sixty-five thousand, four hundred eighty-nine".