1223942720 has 224 divisors, whose sum is σ = 3914217216. Its totient is φ = 352051200.

The previous prime is 1223942683. The next prime is 1223942743. The reversal of 1223942720 is 272493221.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (32).

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 31 ways as a sum of consecutive naturals, for example, 318410 + ... + 322230.

It is an arithmetic number, because the mean of its divisors is an integer number (17474184).

Almost surely, 2^1223942720 is an apocalyptic number.

1223942720 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 1223942720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1957108608).

1223942720 is an abundant number, since it is smaller than the sum of its proper divisors (2690274496).

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

1223942720 is a wasteful number, since it uses less digits than its factorization.

1223942720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3869 (or 3859 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 1223942720 is about 34984.8927395812. The cubic root of 1223942720 is about 1069.6795616583.

The spelling of 1223942720 in words is "one billion, two hundred twenty-three million, nine hundred forty-two thousand, seven hundred twenty".