18869216 has 24 divisors (see below), whose sum is σ = 37537920. Its totient is φ = 9335808.

The previous prime is 18869209. The next prime is 18869237. The reversal of 18869216 is 61296881.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65 + ... + 6143.

It is an arithmetic number, because the mean of its divisors is an integer number (1564080).

Almost surely, 2^18869216 is an apocalyptic number.

18869216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18869216 is a deficient number, since it is larger than the sum of its proper divisors (18668704).

18869216 is an equidigital number, since it uses as much as digits as its factorization.

18869216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6186 (or 6178 counting only the distinct ones).

The product of its digits is 41472, while the sum is 41.

The square root of 18869216 is about 4343.8710846433. The cubic root of 18869216 is about 266.2265016328.

It can be divided in two parts, 18869 and 216, that multiplied together give a palindrome (4075704).

The spelling of 18869216 in words is "eighteen million, eight hundred sixty-nine thousand, two hundred sixteen".