18280812 has 96 divisors (see below), whose sum is σ = 50561280. Its totient is φ = 5080320.

The previous prime is 18280771. The next prime is 18280861. The reversal of 18280812 is 21808281.

It is a self number, because there is not a number n which added to its sum of digits gives 18280812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92698 + ... + 92894.

It is an arithmetic number, because the mean of its divisors is an integer number (526680).

Almost surely, 2^18280812 is an apocalyptic number.

18280812 is a gapful number since it is divisible by the number (12) 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 18280812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25280640).

18280812 is an abundant number, since it is smaller than the sum of its proper divisors (32280468).

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

18280812 is a wasteful number, since it uses less digits than its factorization.

18280812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271 (or 269 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 18280812 is about 4275.6066236266. The cubic root of 18280812 is about 263.4299568866.

The spelling of 18280812 in words is "eighteen million, two hundred eighty thousand, eight hundred twelve".