12312140 has 12 divisors (see below), whose sum is σ = 25855536. Its totient is φ = 4924848.

The previous prime is 12312119. The next prime is 12312143. The reversal of 12312140 is 4121321.

It is not an unprimeable number, because it can be changed into a prime (12312143) 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, 307784 + ... + 307823.

It is an arithmetic number, because the mean of its divisors is an integer number (2154628).

Almost surely, 2^12312140 is an apocalyptic number.

12312140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12312140 is an abundant number, since it is smaller than the sum of its proper divisors (13543396).

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

12312140 is a wasteful number, since it uses less digits than its factorization.

12312140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615616 (or 615614 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 12312140 is about 3508.8659136536. The cubic root of 12312140 is about 230.9109431010.

Adding to 12312140 its reverse (4121321), we get a palindrome (16433461).

The spelling of 12312140 in words is "twelve million, three hundred twelve thousand, one hundred forty".