1223440345 has 8 divisors (see below), whose sum is σ = 1469846664. Its totient is φ = 977606784.

The previous prime is 1223440321. The next prime is 1223440363. The reversal of 1223440345 is 5430443221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 791465689 + 431974656 = 28133^2 + 20784^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1223440345 - 2²³ = 1215051737 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138474 + ... + 147043.

It is an arithmetic number, because the mean of its divisors is an integer number (183730833).

Almost surely, 2^1223440345 is an apocalyptic number.

It is an amenable number.

1223440345 is a deficient number, since it is larger than the sum of its proper divisors (246406319).

1223440345 is an equidigital number, since it uses as much as digits as its factorization.

1223440345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286379.

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 1223440345 is about 34977.7121178616. The cubic root of 1223440345 is about 1069.5331893917.

Adding to 1223440345 its reverse (5430443221), we get a palindrome (6653883566).

The spelling of 1223440345 in words is "one billion, two hundred twenty-three million, four hundred forty thousand, three hundred forty-five".