18214989 has 24 divisors (see below), whose sum is σ = 27037152. Its totient is φ = 10895040.

The previous prime is 18214981. The next prime is 18215003. The reversal of 18214989 is 98941281.

It is not a de Polignac number, because 18214989 - 2³ = 18214981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18214989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18214981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18274 + ... + 19244.

It is an arithmetic number, because the mean of its divisors is an integer number (1126548).

Almost surely, 2^18214989 is an apocalyptic number.

It is an amenable number.

18214989 is a deficient number, since it is larger than the sum of its proper divisors (8822163).

18214989 is a wasteful number, since it uses less digits than its factorization.

18214989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037 (or 1024 counting only the distinct ones).

The product of its digits is 41472, while the sum is 42.

The square root of 18214989 is about 4267.9021778855. The cubic root of 18214989 is about 263.1134026894.

It can be divided in two parts, 182149 and 89, that multiplied together give a palindrome (16211261).

The spelling of 18214989 in words is "eighteen million, two hundred fourteen thousand, nine hundred eighty-nine".