1220443 has 6 divisors (see below), whose sum is σ = 1419756. Its totient is φ = 1046052.

The previous prime is 1220437. The next prime is 1220489. The reversal of 1220443 is 3440221.

It is not a de Polignac number, because 1220443 - 2⁵ = 1220411 is a prime.

It is a super-2 number, since 2×1220443² = 2978962232498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220423) 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 5 ways as a sum of consecutive naturals, for example, 12405 + ... + 12502.

It is an arithmetic number, because the mean of its divisors is an integer number (236626).

2^1220443 is an apocalyptic number.

1220443 is a deficient number, since it is larger than the sum of its proper divisors (199313).

1220443 is an equidigital number, since it uses as much as digits as its factorization.

1220443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24921 (or 24914 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 1220443 is about 1104.7366201951. The cubic root of 1220443 is about 106.8659047468.

Adding to 1220443 its reverse (3440221), we get a palindrome (4660664).

The spelling of 1220443 in words is "one million, two hundred twenty thousand, four hundred forty-three".