43218820 has 24 divisors (see below), whose sum is σ = 91224000. Its totient is φ = 17199072.

The previous prime is 43218793. The next prime is 43218821. The reversal of 43218820 is 2881234.

43218820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (43218821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1450 + ... + 9409.

It is an arithmetic number, because the mean of its divisors is an integer number (3801000).

Almost surely, 2^43218820 is an apocalyptic number.

It is an amenable number.

43218820 is an abundant number, since it is smaller than the sum of its proper divisors (48005180).

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

43218820 is a wasteful number, since it uses less digits than its factorization.

43218820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11067 (or 11065 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 43218820 is about 6574.1022200754. The cubic root of 43218820 is about 350.9330749045.

The spelling of 43218820 in words is "forty-three million, two hundred eighteen thousand, eight hundred twenty".