12172218 has 8 divisors (see below), whose sum is σ = 24344448. Its totient is φ = 4057404.

The previous prime is 12172189. The next prime is 12172219. The reversal of 12172218 is 81227121.

It is a sphenic number, since it is the product of 3 distinct primes.

12172218 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (12172219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1014346 + ... + 1014357.

It is an arithmetic number, because the mean of its divisors is an integer number (3043056).

Almost surely, 2^12172218 is an apocalyptic number.

12172218 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12172218 is a wasteful number, since it uses less digits than its factorization.

12172218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2028708.

The product of its digits is 448, while the sum is 24.

The square root of 12172218 is about 3488.8705908933. The cubic root of 12172218 is about 230.0328749479.

Adding to 12172218 its reverse (81227121), we get a palindrome (93399339).

It can be divided in two parts, 121 and 72218, that multiplied together give a palindrome (8738378).

The spelling of 12172218 in words is "twelve million, one hundred seventy-two thousand, two hundred eighteen".