12318140 has 12 divisors (see below), whose sum is σ = 25868136. Its totient is φ = 4927248.

The previous prime is 12318109. The next prime is 12318143. The reversal of 12318140 is 4181321.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 615907 = 12318140 / (1 + 2 + 3 + 1 + 8 + 1 + 4 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12318143) 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, 307934 + ... + 307973.

It is an arithmetic number, because the mean of its divisors is an integer number (2155678).

Almost surely, 2^12318140 is an apocalyptic number.

12318140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12318140 is an abundant number, since it is smaller than the sum of its proper divisors (13549996).

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

12318140 is a wasteful number, since it uses less digits than its factorization.

12318140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615916 (or 615914 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 12318140 is about 3509.7207866154. The cubic root of 12318140 is about 230.9484464828.

Adding to 12318140 its reverse (4181321), we get a palindrome (16499461).

The spelling of 12318140 in words is "twelve million, three hundred eighteen thousand, one hundred forty".