218243443 has 8 divisors (see below), whose sum is σ = 250614720. Its totient is φ = 187960680.

The previous prime is 218243407. The next prime is 218243491. The reversal of 218243443 is 344342812.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 218243443 - 2¹⁷ = 218112371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218243243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 521905 + ... + 522322.

It is an arithmetic number, because the mean of its divisors is an integer number (31326840).

Almost surely, 2^218243443 is an apocalyptic number.

218243443 is a deficient number, since it is larger than the sum of its proper divisors (32371277).

218243443 is a wasteful number, since it uses less digits than its factorization.

218243443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044257.

The product of its digits is 18432, while the sum is 31.

The square root of 218243443 is about 14773.0647802005. The cubic root of 218243443 is about 602.0701115532.

The spelling of 218243443 in words is "two hundred eighteen million, two hundred forty-three thousand, four hundred forty-three".