18081446 has 4 divisors (see below), whose sum is σ = 27122172. Its totient is φ = 9040722.

The previous prime is 18081439. The next prime is 18081461. The reversal of 18081446 is 64418081.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4520360 + ... + 4520363.

It is an arithmetic number, because the mean of its divisors is an integer number (6780543).

Almost surely, 2^18081446 is an apocalyptic number.

18081446 is a deficient number, since it is larger than the sum of its proper divisors (9040726).

18081446 is an equidigital number, since it uses as much as digits as its factorization.

18081446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9040725.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 18081446 is about 4252.2283569912. The cubic root of 18081446 is about 262.4688204841.

The spelling of 18081446 in words is "eighteen million, eighty-one thousand, four hundred forty-six".