18049280 has 72 divisors (see below), whose sum is σ = 44150400. Its totient is φ = 7067648.

The previous prime is 18049279. The next prime is 18049313. The reversal of 18049280 is 8294081.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75401 + ... + 75639.

It is an arithmetic number, because the mean of its divisors is an integer number (613200).

Almost surely, 2^18049280 is an apocalyptic number.

18049280 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 18049280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22075200).

18049280 is an abundant number, since it is smaller than the sum of its proper divisors (26101120).

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

18049280 is an equidigital number, since it uses as much as digits as its factorization.

18049280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 18049280 is about 4248.4444211970. Note that the first 4 decimals coincide. The cubic root of 18049280 is about 262.3130884086.

The spelling of 18049280 in words is "eighteen million, forty-nine thousand, two hundred eighty".