18288081 has 24 divisors (see below), whose sum is σ = 30315584. Its totient is φ = 10406880.

The previous prime is 18288079. The next prime is 18288097. The reversal of 18288081 is 18088281.

It is a happy number.

It is not a de Polignac number, because 18288081 - 2¹ = 18288079 is a prime.

It is a super-2 number, since 2×18288081² = 668907813325122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18288001) 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, 20415 + ... + 21291.

Almost surely, 2^18288081 is an apocalyptic number.

It is an amenable number.

18288081 is a deficient number, since it is larger than the sum of its proper divisors (12027503).

18288081 is a wasteful number, since it uses less digits than its factorization.

18288081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221 (or 1218 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 36.

The square root of 18288081 is about 4276.4565939572. The cubic root of 18288081 is about 263.4648681478.

The spelling of 18288081 in words is "eighteen million, two hundred eighty-eight thousand, eighty-one".