18233856 has 80 divisors (see below), whose sum is σ = 54014400. Its totient is φ = 6073344.

The previous prime is 18233851. The next prime is 18233861. The reversal of 18233856 is 65833281.

It is an interprime number because it is at equal distance from previous prime (18233851) and next prime (18233861).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18233856.

It is not an unprimeable number, because it can be changed into a prime (18233851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13165 + ... + 14483.

It is an arithmetic number, because the mean of its divisors is an integer number (675180).

Almost surely, 2^18233856 is an apocalyptic number.

18233856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18233856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27007200).

18233856 is an abundant number, since it is smaller than the sum of its proper divisors (35780544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18233856 is an equidigital number, since it uses as much as digits as its factorization.

18233856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346 (or 1324 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 18233856 is about 4270.1119423266. Note that the first 3 decimals coincide. The cubic root of 18233856 is about 263.2042152175.

The spelling of 18233856 in words is "eighteen million, two hundred thirty-three thousand, eight hundred fifty-six".