18081450 has 72 divisors (see below), whose sum is σ = 50719968. Its totient is φ = 4609440.

The previous prime is 18081439. The next prime is 18081461. The reversal of 18081450 is 5418081.

It is an interprime number because it is at equal distance from previous prime (18081439) and next prime (18081461).

It is a Curzon 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 in 35 ways as a sum of consecutive naturals, for example, 9477 + ... + 11223.

It is an arithmetic number, because the mean of its divisors is an integer number (704444).

Almost surely, 2^18081450 is an apocalyptic number.

18081450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18081450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25359984).

18081450 is an abundant number, since it is smaller than the sum of its proper divisors (32638518).

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

18081450 is a wasteful number, since it uses less digits than its factorization.

18081450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788 (or 1780 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 18081450 is about 4252.2288273328. The cubic root of 18081450 is about 262.4688398387.

The spelling of 18081450 in words is "eighteen million, eighty-one thousand, four hundred fifty".