18427212 has 18 divisors (see below), whose sum is σ = 46579988. Its totient is φ = 6142392.

The previous prime is 18427193. The next prime is 18427223. The reversal of 18427212 is 21272481.

It is a tau number, because it is divible by the number of its divisors (18).

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 5 ways as a sum of consecutive naturals, for example, 255898 + ... + 255969.

Almost surely, 2^18427212 is an apocalyptic number.

18427212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18427212 is an abundant number, since it is smaller than the sum of its proper divisors (28152776).

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

18427212 is a wasteful number, since it uses less digits than its factorization.

18427212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511877 (or 511872 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 18427212 is about 4292.6928611304. The cubic root of 18427212 is about 264.1313052056.

Adding to 18427212 its reverse (21272481), we get a palindrome (39699693).

The spelling of 18427212 in words is "eighteen million, four hundred twenty-seven thousand, two hundred twelve".