18468989 has 8 divisors (see below), whose sum is σ = 23026368. Its totient is φ = 14391360.

The previous prime is 18468971. The next prime is 18469037. The reversal of 18468989 is 98986481.

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 18468989 - 2¹² = 18464893 is a prime.

It is a super-2 number, since 2×18468989² = 682207109364242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18468989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18468959) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 119852 + ... + 120005.

It is an arithmetic number, because the mean of its divisors is an integer number (2878296).

Almost surely, 2^18468989 is an apocalyptic number.

It is an amenable number.

18468989 is a deficient number, since it is larger than the sum of its proper divisors (4557379).

18468989 is a wasteful number, since it uses less digits than its factorization.

18468989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239875.

The product of its digits is 995328, while the sum is 53.

The square root of 18468989 is about 4297.5561660088. The cubic root of 18468989 is about 264.3307617671.

The spelling of 18468989 in words is "eighteen million, four hundred sixty-eight thousand, nine hundred eighty-nine".