12543320 has 16 divisors (see below), whose sum is σ = 28222560. Its totient is φ = 5017312.

The previous prime is 12543319. The next prime is 12543329. The reversal of 12543320 is 2334521.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 12543292 and 12543301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12543329) 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, 156752 + ... + 156831.

It is an arithmetic number, because the mean of its divisors is an integer number (1763910).

Almost surely, 2^12543320 is an apocalyptic number.

12543320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12543320 is an abundant number, since it is smaller than the sum of its proper divisors (15679240).

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

12543320 is a wasteful number, since it uses less digits than its factorization.

12543320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313594 (or 313590 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 12543320 is about 3541.6549803729. The cubic root of 12543320 is about 232.3472307396.

Adding to 12543320 its reverse (2334521), we get a palindrome (14877841).

The spelling of 12543320 in words is "twelve million, five hundred forty-three thousand, three hundred twenty".