1223272120 has 128 divisors (see below), whose sum is σ = 3207600000. Its totient is φ = 411236352.

The previous prime is 1223272109. The next prime is 1223272151. The reversal of 1223272120 is 212723221.

It is a junction number, because it is equal to n+sod(n) for n = 1223272091 and 1223272100.

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, 4547346 + ... + 4547614.

It is an arithmetic number, because the mean of its divisors is an integer number (25059375).

Almost surely, 2^1223272120 is an apocalyptic number.

1223272120 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 1223272120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1603800000).

1223272120 is an abundant number, since it is smaller than the sum of its proper divisors (1984327880).

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

1223272120 is a wasteful number, since it uses less digits than its factorization.

1223272120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545 (or 541 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 1223272120 is about 34975.3072895722. The cubic root of 1223272120 is about 1069.4841663046.

Adding to 1223272120 its reverse (212723221), we get a palindrome (1435995341).

The spelling of 1223272120 in words is "one billion, two hundred twenty-three million, two hundred seventy-two thousand, one hundred twenty".