12543918 has 16 divisors (see below), whose sum is σ = 25499856. Its totient is φ = 4112640.

The previous prime is 12543911. The next prime is 12543919. The reversal of 12543918 is 81934521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12543911) 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, 16771 + ... + 17502.

It is an arithmetic number, because the mean of its divisors is an integer number (1593741).

Almost surely, 2^12543918 is an apocalyptic number.

12543918 is an abundant number, since it is smaller than the sum of its proper divisors (12955938).

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

12543918 is a wasteful number, since it uses less digits than its factorization.

12543918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34339.

The product of its digits is 8640, while the sum is 33.

The square root of 12543918 is about 3541.7394031747. The cubic root of 12543918 is about 232.3509230485.

The spelling of 12543918 in words is "twelve million, five hundred forty-three thousand, nine hundred eighteen".