12312018 has 24 divisors (see below), whose sum is σ = 27298128. Its totient is φ = 4008312.

The previous prime is 12312017. The next prime is 12312023. The reversal of 12312018 is 81021321.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (12312011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7180 + ... + 8727.

It is an arithmetic number, because the mean of its divisors is an integer number (1137422).

Almost surely, 2^12312018 is an apocalyptic number.

12312018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12312018 is an abundant number, since it is smaller than the sum of its proper divisors (14986110).

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

12312018 is a wasteful number, since it uses less digits than its factorization.

12312018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15958 (or 15955 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 12312018 is about 3508.8485290762. The cubic root of 12312018 is about 230.9101804058.

Adding to 12312018 its reverse (81021321), we get a palindrome (93333339).

It can be divided in two parts, 1231 and 2018, that added together give a square (3249 = 57²).

The spelling of 12312018 in words is "twelve million, three hundred twelve thousand, eighteen".