12312320 has 36 divisors (see below), whose sum is σ = 29494920. Its totient is φ = 4924416.

The previous prime is 12312283. The next prime is 12312331. The reversal of 12312320 is 2321321.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12312295 and 12312304.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3530 + ... + 6089.

Almost surely, 2^12312320 is an apocalyptic number.

12312320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12312320 is an abundant number, since it is smaller than the sum of its proper divisors (17182600).

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

12312320 is an frugal number, since it uses more digits than its factorization.

12312320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9640 (or 9626 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 12312320 is about 3508.8915628728. The cubic root of 12312320 is about 230.9120683797.

Adding to 12312320 its reverse (2321321), we get a palindrome (14633641).

Subtracting from 12312320 its reverse (2321321), we obtain a palindrome (9990999).

The spelling of 12312320 in words is "twelve million, three hundred twelve thousand, three hundred twenty".