4220549 has 4 divisors (see below), whose sum is σ = 4300236. Its totient is φ = 4140864.

The previous prime is 4220543. The next prime is 4220551. The reversal of 4220549 is 9450224.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2280100 + 1940449 = 1510^2 + 1393^2 .

It is a cyclic number.

It is not a de Polignac number, because 4220549 - 2⁴ = 4220533 is a prime.

It is a super-2 number, since 2×4220549² = 35626067722802, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4220543) 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, 39764 + ... + 39869.

It is an arithmetic number, because the mean of its divisors is an integer number (1075059).

Almost surely, 2^4220549 is an apocalyptic number.

It is an amenable number.

4220549 is a deficient number, since it is larger than the sum of its proper divisors (79687).

4220549 is an equidigital number, since it uses as much as digits as its factorization.

4220549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79686.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 4220549 is about 2054.3974785810. The cubic root of 4220549 is about 161.6055663581.

The spelling of 4220549 in words is "four million, two hundred twenty thousand, five hundred forty-nine".