12543455 has 4 divisors (see below), whose sum is σ = 15052152. Its totient is φ = 10034760.

The previous prime is 12543449. The next prime is 12543463. The reversal of 12543455 is 55434521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55434521 = 73 ⋅759377.

It is not a de Polignac number, because 12543455 - 2⁸ = 12543199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1254341 + ... + 1254350.

It is an arithmetic number, because the mean of its divisors is an integer number (3763038).

Almost surely, 2^12543455 is an apocalyptic number.

12543455 is a deficient number, since it is larger than the sum of its proper divisors (2508697).

12543455 is an equidigital number, since it uses as much as digits as its factorization.

12543455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2508696.

The product of its digits is 12000, while the sum is 29.

The square root of 12543455 is about 3541.6740392080. The cubic root of 12543455 is about 232.3480642978.

Adding to 12543455 its reverse (55434521), we get a palindrome (67977976).

The spelling of 12543455 in words is "twelve million, five hundred forty-three thousand, four hundred fifty-five".