18868280 has 32 divisors (see below), whose sum is σ = 44301600. Its totient is φ = 7218816.

The previous prime is 18868279. The next prime is 18868301. The reversal of 18868280 is 8286881.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 9335 + ... + 11174.

It is an arithmetic number, because the mean of its divisors is an integer number (1384425).

Almost surely, 2^18868280 is an apocalyptic number.

18868280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18868280 is an abundant number, since it is smaller than the sum of its proper divisors (25433320).

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

18868280 is a wasteful number, since it uses less digits than its factorization.

18868280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20543 (or 20539 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 41.

The square root of 18868280 is about 4343.7633453032. The cubic root of 18868280 is about 266.2220995399. Note that the first 3 decimals are identical.

The spelling of 18868280 in words is "eighteen million, eight hundred sixty-eight thousand, two hundred eighty".