18030280 has 32 divisors (see below), whose sum is σ = 40937400. Its totient is φ = 7146496.

The previous prime is 18030241. The next prime is 18030293. The reversal of 18030280 is 8203081.

It can be written as a sum of positive squares in 4 ways, for example, as 8678916 + 9351364 = 2946^2 + 3058^2 .

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 7 ways as a sum of consecutive naturals, for example, 2526 + ... + 6514.

Almost surely, 2^18030280 is an apocalyptic number.

18030280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18030280 is an abundant number, since it is smaller than the sum of its proper divisors (22907120).

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

18030280 is a wasteful number, since it uses less digits than its factorization.

18030280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4113 (or 4109 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 18030280 is about 4246.2077198366. The cubic root of 18030280 is about 262.2210127409.

The spelling of 18030280 in words is "eighteen million, thirty thousand, two hundred eighty".