18273420 has 108 divisors (see below), whose sum is σ = 60999120. Its totient is φ = 4424640.

The previous prime is 18273407. The next prime is 18273443. The reversal of 18273420 is 2437281.

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 35 ways as a sum of consecutive naturals, for example, 21361 + ... + 22199.

Almost surely, 2^18273420 is an apocalyptic number.

18273420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18273420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30499560).

18273420 is an abundant number, since it is smaller than the sum of its proper divisors (42725700).

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

18273420 is a wasteful number, since it uses less digits than its factorization.

18273420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876 (or 860 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 18273420 is about 4274.7420974838. The cubic root of 18273420 is about 263.3944453939.

The spelling of 18273420 in words is "eighteen million, two hundred seventy-three thousand, four hundred twenty".