1223720316 has 432 divisors, whose sum is σ = 4255995744. Its totient is φ = 292626432.

The previous prime is 1223720297. The next prime is 1223720321. The reversal of 1223720316 is 6130273221.

It is a super-2 number, since 2×1223720316² = 2994982823582279712, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1223720316.

It is a congruent 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 143 ways as a sum of consecutive naturals, for example, 16763256 + ... + 16763328.

It is an arithmetic number, because the mean of its divisors is an integer number (9851842).

Almost surely, 2^1223720316 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1223720316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2127997872).

1223720316 is an abundant number, since it is smaller than the sum of its proper divisors (3032275428).

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

1223720316 is a wasteful number, since it uses less digits than its factorization.

1223720316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 1223720316 is about 34981.7140231865. The cubic root of 1223720316 is about 1069.6147668438.

Adding to 1223720316 its reverse (6130273221), we get a palindrome (7353993537).

The spelling of 1223720316 in words is "one billion, two hundred twenty-three million, seven hundred twenty thousand, three hundred sixteen".