1223172844 has 48 divisors (see below), whose sum is σ = 2296163520. Its totient is φ = 569796480.

The previous prime is 1223172833. The next prime is 1223172901. The reversal of 1223172844 is 4482713221.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1995082 + ... + 1995694.

It is an arithmetic number, because the mean of its divisors is an integer number (47836740).

Almost surely, 2^1223172844 is an apocalyptic number.

It is an amenable number.

1223172844 is a deficient number, since it is larger than the sum of its proper divisors (1072990676).

1223172844 is an equidigital number, since it uses as much as digits as its factorization.

1223172844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727 (or 679 counting only the distinct ones).

The product of its digits is 21504, while the sum is 34.

The square root of 1223172844 is about 34973.8880309296. Note that the first 3 decimals coincide. The cubic root of 1223172844 is about 1069.4552337990.

The spelling of 1223172844 in words is "one billion, two hundred twenty-three million, one hundred seventy-two thousand, eight hundred forty-four".