18166408 has 32 divisors (see below), whose sum is σ = 37681560. Its totient is φ = 8156160.

The previous prime is 18166397. The next prime is 18166429. The reversal of 18166408 is 80466181.

It can be written as a sum of positive squares in 4 ways, for example, as 16144324 + 2022084 = 4018^2 + 1422^2 .

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1488 + ... + 6208.

Almost surely, 2^18166408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18166408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18840780).

18166408 is an abundant number, since it is smaller than the sum of its proper divisors (19515152).

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

18166408 is a wasteful number, since it uses less digits than its factorization.

18166408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4777 (or 4773 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 18166408 is about 4262.2069400722. The cubic root of 18166408 is about 262.8792787866.

The spelling of 18166408 in words is "eighteen million, one hundred sixty-six thousand, four hundred eight".