1223210720 has 192 divisors, whose sum is σ = 3135283200. Its totient is φ = 450078720.

The previous prime is 1223210717. The next prime is 1223210731. The reversal of 1223210720 is 270123221.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1223210692 and 1223210701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15483641 + ... + 15483719.

It is an arithmetic number, because the mean of its divisors is an integer number (16329600).

Almost surely, 2^1223210720 is an apocalyptic number.

1223210720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1223210720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1567641600).

1223210720 is an abundant number, since it is smaller than the sum of its proper divisors (1912072480).

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

1223210720 is a wasteful number, since it uses less digits than its factorization.

1223210720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 1223210720 is about 34974.4295164339. The cubic root of 1223210720 is about 1069.4662723775.

Adding to 1223210720 its reverse (270123221), we get a palindrome (1493333941).

The spelling of 1223210720 in words is "one billion, two hundred twenty-three million, two hundred ten thousand, seven hundred twenty".