43218065 has 16 divisors (see below), whose sum is σ = 59555520. Its totient is φ = 29776320.

The previous prime is 43218047. The next prime is 43218067. The reversal of 43218065 is 56081234.

It is not a de Polignac number, because 43218065 - 2¹⁸ = 42955921 is a prime.

It is a super-2 number, since 2×43218065² = 3735602284688450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (43218067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19634 + ... + 21723.

It is an arithmetic number, because the mean of its divisors is an integer number (3722220).

Almost surely, 2^43218065 is an apocalyptic number.

It is an amenable number.

43218065 is a deficient number, since it is larger than the sum of its proper divisors (16337455).

43218065 is a wasteful number, since it uses less digits than its factorization.

43218065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41392.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 43218065 is about 6574.0447975352. The cubic root of 43218065 is about 350.9310313811.

Adding to 43218065 its reverse (56081234), we get a palindrome (99299299).

The spelling of 43218065 in words is "forty-three million, two hundred eighteen thousand, sixty-five".