1220443423 has 2 divisors, whose sum is σ = 1220443424. Its totient is φ = 1220443422.

The previous prime is 1220443421. The next prime is 1220443439. The reversal of 1220443423 is 3243440221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220443423 - 2¹ = 1220443421 is a prime.

Together with 1220443421, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220443421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610221711 + 610221712.

It is an arithmetic number, because the mean of its divisors is an integer number (610221712).

Almost surely, 2^1220443423 is an apocalyptic number.

1220443423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220443423 is an equidigital number, since it uses as much as digits as its factorization.

1220443423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 1220443423 is about 34934.8453982553. The cubic root of 1220443423 is about 1068.6591709320.

Adding to 1220443423 its reverse (3243440221), we get a palindrome (4463883644).

The spelling of 1220443423 in words is "one billion, two hundred twenty million, four hundred forty-three thousand, four hundred twenty-three".