18007212 has 24 divisors (see below), whose sum is σ = 44228800. Its totient is φ = 5686416.

The previous prime is 18007207. The next prime is 18007237. The reversal of 18007212 is 21270081.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39262 + ... + 39717.

Almost surely, 2^18007212 is an apocalyptic number.

18007212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18007212 is an abundant number, since it is smaller than the sum of its proper divisors (26221588).

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

18007212 is a wasteful number, since it uses less digits than its factorization.

18007212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79005 (or 79003 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 18007212 is about 4243.4905443514. The cubic root of 18007212 is about 262.1091362046.

Adding to 18007212 its reverse (21270081), we get a palindrome (39277293).

The spelling of 18007212 in words is "eighteen million, seven thousand, two hundred twelve".