11986543 has 4 divisors (see below), whose sum is σ = 11993688. Its totient is φ = 11979400.

The previous prime is 11986529. The next prime is 11986571. The reversal of 11986543 is 34568911.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11986543 is a prime.

It is a super-3 number, since 3×11986543³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11986573) 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, 468 + ... + 4918.

It is an arithmetic number, because the mean of its divisors is an integer number (2998422).

Almost surely, 2^11986543 is an apocalyptic number.

11986543 is a deficient number, since it is larger than the sum of its proper divisors (7145).

11986543 is an equidigital number, since it uses as much as digits as its factorization.

11986543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7144.

The product of its digits is 25920, while the sum is 37.

The square root of 11986543 is about 3462.1587196430. The cubic root of 11986543 is about 228.8572363917.

The spelling of 11986543 in words is "eleven million, nine hundred eighty-six thousand, five hundred forty-three".