43218442 has 8 divisors (see below), whose sum is σ = 66579876. Its totient is φ = 21025152.

The previous prime is 43218421. The next prime is 43218443. The reversal of 43218442 is 24481234.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 43178041 + 40401 = 6571^2 + 201^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 43218442.

It is not an unprimeable number, because it can be changed into a prime (43218443) 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, 291943 + ... + 292090.

Almost surely, 2^43218442 is an apocalyptic number.

43218442 is a deficient number, since it is larger than the sum of its proper divisors (23361434).

43218442 is a wasteful number, since it uses less digits than its factorization.

43218442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584072.

The product of its digits is 6144, while the sum is 28.

The square root of 43218442 is about 6574.0734708398. The cubic root of 43218442 is about 350.9320517925.

Adding to 43218442 its reverse (24481234), we get a palindrome (67699676).

It can be divided in two parts, 43218 and 442, that added together give a triangular number (43660 = T₂₉₅).

The spelling of 43218442 in words is "forty-three million, two hundred eighteen thousand, four hundred forty-two".