543816 has 96 divisors (see below), whose sum is σ = 1834560. Its totient is φ = 141696.

The previous prime is 543811. The next prime is 543827. The reversal of 543816 is 618345.

543816 is nontrivially palindromic in base 16.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 543816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (543811) by changing a digit.

543816 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6511 + ... + 6593.

It is an arithmetic number, because the mean of its divisors is an integer number (19110).

2⁵⁴³⁸¹⁶ is an apocalyptic number.

543816 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 543816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (917280).

543816 is an abundant number, since it is smaller than the sum of its proper divisors (1290744).

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

543816 is a wasteful number, since it uses less digits than its factorization.

543816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 108 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 543816 is about 737.4388110210. The cubic root of 543816 is about 81.6238972684.

Subtracting 543816 from its reverse (618345), we obtain a square (74529 = 273²).

The spelling of 543816 in words is "five hundred forty-three thousand, eight hundred sixteen".