1223979120 has 480 divisors, whose sum is σ = 5228236800. Its totient is φ = 257707008.

The previous prime is 1223979103. The next prime is 1223979121. The reversal of 1223979120 is 219793221.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223979121) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 2555041 + ... + 2555519.

It is an arithmetic number, because the mean of its divisors is an integer number (10892160).

Almost surely, 2^1223979120 is an apocalyptic number.

1223979120 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 1223979120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2614118400).

1223979120 is an abundant number, since it is smaller than the sum of its proper divisors (4004257680).

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

1223979120 is a wasteful number, since it uses less digits than its factorization.

1223979120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534 (or 509 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 1223979120 is about 34985.4129602610. The cubic root of 1223979120 is about 1069.6901656268.

The spelling of 1223979120 in words is "one billion, two hundred twenty-three million, nine hundred seventy-nine thousand, one hundred twenty".