12812543 has 4 divisors (see below), whose sum is σ = 13566240. Its totient is φ = 12058848.

The previous prime is 12812539. The next prime is 12812549. The reversal of 12812543 is 34521821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34521821 = 1871 ⋅18451.

It is not a de Polignac number, because 12812543 - 2² = 12812539 is a prime.

It is a super-2 number, since 2×12812543² = 328322516253698, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2 and base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12812549) by changing a digit.

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, 376823 + ... + 376856.

It is an arithmetic number, because the mean of its divisors is an integer number (3391560).

Almost surely, 2^12812543 is an apocalyptic number.

12812543 is a deficient number, since it is larger than the sum of its proper divisors (753697).

12812543 is an equidigital number, since it uses as much as digits as its factorization.

12812543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753696.

The product of its digits is 1920, while the sum is 26.

The square root of 12812543 is about 3579.4612723146. The cubic root of 12812543 is about 233.9978023511.

The spelling of 12812543 in words is "twelve million, eight hundred twelve thousand, five hundred forty-three".