18143280 has 120 divisors (see below), whose sum is σ = 61746048. Its totient is φ = 4773888.

The previous prime is 18143263. The next prime is 18143287. The reversal of 18143280 is 8234181.

It is a tau number, because it is divible by the number of its divisors (120).

It is not an unprimeable number, because it can be changed into a prime (18143287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81249 + ... + 81471.

Almost surely, 2^18143280 is an apocalyptic number.

18143280 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 18143280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30873024).

18143280 is an abundant number, since it is smaller than the sum of its proper divisors (43602768).

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

18143280 is a wasteful number, since it uses less digits than its factorization.

18143280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 18143280 is about 4259.4929275678. The cubic root of 18143280 is about 262.7676725385.

Subtracting from 18143280 its reverse (8234181), we obtain a palindrome (9909099).

The spelling of 18143280 in words is "eighteen million, one hundred forty-three thousand, two hundred eighty".