4205540 has 12 divisors (see below), whose sum is σ = 8831676. Its totient is φ = 1682208.

The previous prime is 4205533. The next prime is 4205549. The reversal of 4205540 is 455024.

It is a happy number.

4205540 is nontrivially palindromic in base 6.

It can be written as a sum of positive squares in 2 ways, for example, as 1308736 + 2896804 = 1144^2 + 1702^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 210277 = 4205540 / (4 + 2 + 0 + 5 + 5 + 4 + 0).

It is not an unprimeable number, because it can be changed into a prime (4205549) 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, 105119 + ... + 105158.

It is an arithmetic number, because the mean of its divisors is an integer number (735973).

Almost surely, 2^4205540 is an apocalyptic number.

It is an amenable number.

4205540 is an abundant number, since it is smaller than the sum of its proper divisors (4626136).

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

4205540 is a wasteful number, since it uses less digits than its factorization.

4205540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210286 (or 210284 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 4205540 is about 2050.7413293734. The cubic root of 4205540 is about 161.4137730748.

The spelling of 4205540 in words is "four million, two hundred five thousand, five hundred forty".