18021480 has 64 divisors (see below), whose sum is σ = 54777600. Its totient is φ = 4742400.

The previous prime is 18021469. The next prime is 18021503. The reversal of 18021480 is 8412081.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 18021480.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8530 + ... + 10430.

It is an arithmetic number, because the mean of its divisors is an integer number (855900).

Almost surely, 2^18021480 is an apocalyptic number.

18021480 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 18021480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27388800).

18021480 is an abundant number, since it is smaller than the sum of its proper divisors (36756120).

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

18021480 is a wasteful number, since it uses less digits than its factorization.

18021480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994 (or 1990 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 18021480 is about 4245.1713746326. The cubic root of 18021480 is about 262.1783452499.

The spelling of 18021480 in words is "eighteen million, twenty-one thousand, four hundred eighty".