12311918 has 8 divisors (see below), whose sum is σ = 18517248. Its totient is φ = 6139504.

The previous prime is 12311917. The next prime is 12311933. The reversal of 12311918 is 81911321.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12311911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7271 + ... + 8802.

It is an arithmetic number, because the mean of its divisors is an integer number (2314656).

Almost surely, 2^12311918 is an apocalyptic number.

12311918 is a deficient number, since it is larger than the sum of its proper divisors (6205330).

12311918 is a wasteful number, since it uses less digits than its factorization.

12311918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16458.

The product of its digits is 432, while the sum is 26.

The square root of 12311918 is about 3508.8342793583. The cubic root of 12311918 is about 230.9095552421.

The spelling of 12311918 in words is "twelve million, three hundred eleven thousand, nine hundred eighteen".