18056233 has 4 divisors (see below), whose sum is σ = 19445188. Its totient is φ = 16667280.

The previous prime is 18056221. The next prime is 18056243. The reversal of 18056233 is 33265081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33265081 = 1409 ⋅23609.

It can be written as a sum of positive squares in 2 ways, for example, as 8340544 + 9715689 = 2888^2 + 3117^2 .

It is a cyclic number.

It is not a de Polignac number, because 18056233 - 2⁵ = 18056201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18056243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 694458 + ... + 694483.

It is an arithmetic number, because the mean of its divisors is an integer number (4861297).

Almost surely, 2^18056233 is an apocalyptic number.

18056233 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18056233 is a deficient number, since it is larger than the sum of its proper divisors (1388955).

18056233 is a wasteful number, since it uses less digits than its factorization.

18056233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388954.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 18056233 is about 4249.2626419180. The cubic root of 18056233 is about 262.3467671067.

The spelling of 18056233 in words is "eighteen million, fifty-six thousand, two hundred thirty-three".