18013233 has 24 divisors (see below), whose sum is σ = 28102368. Its totient is φ = 10233216.

The previous prime is 18013213. The next prime is 18013253. The reversal of 18013233 is 33231081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18013213) and next prime (18013253).

It is not a de Polignac number, because 18013233 - 2⁹ = 18012721 is a prime.

It is a super-2 number, since 2×18013233² = 648953126224578, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18013213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41385 + ... + 41817.

It is an arithmetic number, because the mean of its divisors is an integer number (1170932).

Almost surely, 2^18013233 is an apocalyptic number.

It is an amenable number.

18013233 is a deficient number, since it is larger than the sum of its proper divisors (10089135).

18013233 is a wasteful number, since it uses less digits than its factorization.

18013233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733 (or 726 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 18013233 is about 4244.1999246030. The cubic root of 18013233 is about 262.1383464130.

The spelling of 18013233 in words is "eighteen million, thirteen thousand, two hundred thirty-three".