12181418 has 8 divisors (see below), whose sum is σ = 19347012. Its totient is φ = 5732416.

The previous prime is 12181417. The next prime is 12181423. The reversal of 12181418 is 81418121.

It can be written as a sum of positive squares in 2 ways, for example, as 11812969 + 368449 = 3437^2 + 607^2 .

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

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12181417) 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, 179105 + ... + 179172.

Almost surely, 2^12181418 is an apocalyptic number.

12181418 is a deficient number, since it is larger than the sum of its proper divisors (7165594).

12181418 is a wasteful number, since it uses less digits than its factorization.

12181418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358296.

The product of its digits is 512, while the sum is 26.

The square root of 12181418 is about 3490.1888201070. The cubic root of 12181418 is about 230.0908147990.

Adding to 12181418 its reverse (81418121), we get a palindrome (93599539).

The spelling of 12181418 in words is "twelve million, one hundred eighty-one thousand, four hundred eighteen".