18489280 has 56 divisors (see below), whose sum is σ = 46360080. Its totient is φ = 7004160.

The previous prime is 18489277. The next prime is 18489281. The reversal of 18489280 is 8298481.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18489281) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4560 + ... + 7600.

Almost surely, 2^18489280 is an apocalyptic number.

18489280 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 18489280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23180040).

18489280 is an abundant number, since it is smaller than the sum of its proper divisors (27870800).

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

18489280 is a wasteful number, since it uses less digits than its factorization.

18489280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3077 (or 3067 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 18489280 is about 4299.9162782547. The cubic root of 18489280 is about 264.4275288842.

It can be divided in two parts, 18489 and 280, that added together give a square (18769 = 137²).

The spelling of 18489280 in words is "eighteen million, four hundred eighty-nine thousand, two hundred eighty".