12578543 has 4 divisors (see below), whose sum is σ = 12815928. Its totient is φ = 12341160.

The previous prime is 12578507. The next prime is 12578549. The reversal of 12578543 is 34587521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12578543 - 2¹⁰ = 12577519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12578549) 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, 118613 + ... + 118718.

It is an arithmetic number, because the mean of its divisors is an integer number (3203982).

Almost surely, 2^12578543 is an apocalyptic number.

12578543 is a deficient number, since it is larger than the sum of its proper divisors (237385).

12578543 is an equidigital number, since it uses as much as digits as its factorization.

12578543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237384.

The product of its digits is 33600, while the sum is 35.

The square root of 12578543 is about 3546.6241695449. The cubic root of 12578543 is about 232.5645128719.

The spelling of 12578543 in words is "twelve million, five hundred seventy-eight thousand, five hundred forty-three".