18328263 has 12 divisors (see below), whose sum is σ = 25548600. Its totient is φ = 11686576.

The previous prime is 18328253. The next prime is 18328267. The reversal of 18328263 is 36282381.

It is not a de Polignac number, because 18328263 - 2⁵ = 18328231 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18328267) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4188 + ... + 7361.

It is an arithmetic number, because the mean of its divisors is an integer number (2129050).

Almost surely, 2^18328263 is an apocalyptic number.

18328263 is a deficient number, since it is larger than the sum of its proper divisors (7220337).

18328263 is a wasteful number, since it uses less digits than its factorization.

18328263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11598 (or 11575 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 18328263 is about 4281.1520645733. The cubic root of 18328263 is about 263.6576859236.

The spelling of 18328263 in words is "eighteen million, three hundred twenty-eight thousand, two hundred sixty-three".