18166442 has 16 divisors (see below), whose sum is σ = 31197312. Its totient is φ = 7771920.

The previous prime is 18166433. The next prime is 18166453. The reversal of 18166442 is 24466181.

It is a super-2 number, since 2×18166442² = 660039229878728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18166399 and 18166408.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 14243 + ... + 15465.

It is an arithmetic number, because the mean of its divisors is an integer number (1949832).

Almost surely, 2^18166442 is an apocalyptic number.

18166442 is a deficient number, since it is larger than the sum of its proper divisors (13030870).

18166442 is a wasteful number, since it uses less digits than its factorization.

18166442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2293.

The product of its digits is 9216, while the sum is 32.

The square root of 18166442 is about 4262.2109286144. The cubic root of 18166442 is about 262.8794427870.

The spelling of 18166442 in words is "eighteen million, one hundred sixty-six thousand, four hundred forty-two".