1220323445 has 16 divisors (see below), whose sum is σ = 1634668992. Its totient is φ = 866866560.

The previous prime is 1220323441. The next prime is 1220323459. The reversal of 1220323445 is 5443230221.

It is not a de Polignac number, because 1220323445 - 2² = 1220323441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220323441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255632 + ... + 260361.

It is an arithmetic number, because the mean of its divisors is an integer number (102166812).

Almost surely, 2^1220323445 is an apocalyptic number.

It is an amenable number.

1220323445 is a deficient number, since it is larger than the sum of its proper divisors (414345547).

1220323445 is a wasteful number, since it uses less digits than its factorization.

1220323445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516052.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 1220323445 is about 34933.1281880109. The cubic root of 1220323445 is about 1068.6241509304.

Adding to 1220323445 its reverse (5443230221), we get a palindrome (6663553666).

The spelling of 1220323445 in words is "one billion, two hundred twenty million, three hundred twenty-three thousand, four hundred forty-five".