18216280 has 16 divisors (see below), whose sum is σ = 40986720. Its totient is φ = 7286496.

The previous prime is 18216277. The next prime is 18216281. The reversal of 18216280 is 8261281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18216281) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 227664 + ... + 227743.

It is an arithmetic number, because the mean of its divisors is an integer number (2561670).

Almost surely, 2^18216280 is an apocalyptic number.

18216280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18216280 is an abundant number, since it is smaller than the sum of its proper divisors (22770440).

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

18216280 is a wasteful number, since it uses less digits than its factorization.

18216280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455418 (or 455414 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 18216280 is about 4268.0534204717. The cubic root of 18216280 is about 263.1196186576.

It can be divided in two parts, 18216 and 280, that added together give a square (18496 = 136²).

The spelling of 18216280 in words is "eighteen million, two hundred sixteen thousand, two hundred eighty".