18404166 has 64 divisors (see below), whose sum is σ = 43545600. Its totient is φ = 5122560.

The previous prime is 18404161. The next prime is 18404189. The reversal of 18404166 is 66140481.

It is a super-3 number, since 3×18404166³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18404161) 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 31 ways as a sum of consecutive naturals, for example, 52560 + ... + 52908.

It is an arithmetic number, because the mean of its divisors is an integer number (680400).

Almost surely, 2^18404166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18404166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21772800).

18404166 is an abundant number, since it is smaller than the sum of its proper divisors (25141434).

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

18404166 is a wasteful number, since it uses less digits than its factorization.

18404166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18404166 is about 4290.0076923008. The cubic root of 18404166 is about 264.0211472959.

It can be divided in two parts, 1840 and 4166, that added together give a palindrome (6006).

The spelling of 18404166 in words is "eighteen million, four hundred four thousand, one hundred sixty-six".