43161220 has 12 divisors (see below), whose sum is σ = 90638604. Its totient is φ = 17264480.

The previous prime is 43161211. The next prime is 43161227. The reversal of 43161220 is 2216134.

It can be written as a sum of positive squares in 2 ways, for example, as 34292736 + 8868484 = 5856^2 + 2978^2 .

It is not an unprimeable number, because it can be changed into a prime (43161227) 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, 1079011 + ... + 1079050.

It is an arithmetic number, because the mean of its divisors is an integer number (7553217).

Almost surely, 2^43161220 is an apocalyptic number.

It is an amenable number.

43161220 is an abundant number, since it is smaller than the sum of its proper divisors (47477384).

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

43161220 is a wasteful number, since it uses less digits than its factorization.

43161220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2158070 (or 2158068 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 43161220 is about 6569.7199331478. The cubic root of 43161220 is about 350.7771032565. Note that the first 3 decimals are identical.

Adding to 43161220 its reverse (2216134), we get a palindrome (45377354).

The spelling of 43161220 in words is "forty-three million, one hundred sixty-one thousand, two hundred twenty".