1223634644 has 12 divisors (see below), whose sum is σ = 2162151264. Its totient is φ = 605877144.

The previous prime is 1223634641. The next prime is 1223634649. The reversal of 1223634644 is 4464363221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223634641) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1484582 + ... + 1485405.

It is an arithmetic number, because the mean of its divisors is an integer number (180179272).

Almost surely, 2^1223634644 is an apocalyptic number.

It is an amenable number.

1223634644 is a deficient number, since it is larger than the sum of its proper divisors (938516620).

1223634644 is a wasteful number, since it uses less digits than its factorization.

1223634644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2970094 (or 2970092 counting only the distinct ones).

The product of its digits is 82944, while the sum is 35.

The square root of 1223634644 is about 34980.4894762781. The cubic root of 1223634644 is about 1069.5898052101.

Adding to 1223634644 its reverse (4464363221), we get a palindrome (5687997865).

The spelling of 1223634644 in words is "one billion, two hundred twenty-three million, six hundred thirty-four thousand, six hundred forty-four".