1223544042 has 80 divisors (see below), whose sum is σ = 3139456320. Its totient is φ = 348898752.

The previous prime is 1223544031. The next prime is 1223544073. The reversal of 1223544042 is 2404453221.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1223543997 and 1223544015.

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 39 ways as a sum of consecutive naturals, for example, 971209 + ... + 972467.

It is an arithmetic number, because the mean of its divisors is an integer number (39243204).

Almost surely, 2^1223544042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1223544042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1569728160).

1223544042 is an abundant number, since it is smaller than the sum of its proper divisors (1915912278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1223544042 is a wasteful number, since it uses less digits than its factorization.

1223544042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137 (or 2128 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 1223544042 is about 34979.1944161097. The cubic root of 1223544042 is about 1069.5634058902.

Adding to 1223544042 its reverse (2404453221), we get a palindrome (3627997263).

The spelling of 1223544042 in words is "one billion, two hundred twenty-three million, five hundred forty-four thousand, forty-two".