12543861 has 8 divisors (see below), whose sum is σ = 18245664. Its totient is φ = 7602320.

The previous prime is 12543859. The next prime is 12543887. The reversal of 12543861 is 16834521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12543861 - 2¹ = 12543859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12543061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190026 + ... + 190091.

It is an arithmetic number, because the mean of its divisors is an integer number (2280708).

Almost surely, 2^12543861 is an apocalyptic number.

12543861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12543861 is a deficient number, since it is larger than the sum of its proper divisors (5701803).

12543861 is a wasteful number, since it uses less digits than its factorization.

12543861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380131.

The product of its digits is 5760, while the sum is 30.

The square root of 12543861 is about 3541.7313562720. The cubic root of 12543861 is about 232.3505711110.

It can be divided in two parts, 1254 and 3861, that added together give a palindrome (5115).

The spelling of 12543861 in words is "twelve million, five hundred forty-three thousand, eight hundred sixty-one".