18236166 has 32 divisors (see below), whose sum is σ = 39644640. Its totient is φ = 5558784.

The previous prime is 18236159. The next prime is 18236167. The reversal of 18236166 is 66163281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18236167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7780 + ... + 9848.

It is an arithmetic number, because the mean of its divisors is an integer number (1238895).

Almost surely, 2^18236166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18236166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19822320).

18236166 is an abundant number, since it is smaller than the sum of its proper divisors (21408474).

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

18236166 is a wasteful number, since it uses less digits than its factorization.

18236166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2200.

The product of its digits is 10368, while the sum is 33.

The square root of 18236166 is about 4270.3824184726. The cubic root of 18236166 is about 263.2153296350.

The spelling of 18236166 in words is "eighteen million, two hundred thirty-six thousand, one hundred sixty-six".