1224021856 has 72 divisors (see below), whose sum is σ = 2540395872. Its totient is φ = 580320000.

The previous prime is 1224021853. The next prime is 1224021871. The reversal of 1224021856 is 6581204221.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224021853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1629481 + ... + 1630231.

It is an arithmetic number, because the mean of its divisors is an integer number (35283276).

Almost surely, 2^1224021856 is an apocalyptic number.

1224021856 is a gapful number since it is divisible by the number (16) 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 1224021856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1270197936).

1224021856 is an abundant number, since it is smaller than the sum of its proper divisors (1316374016).

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

1224021856 is an equidigital number, since it uses as much as digits as its factorization.

1224021856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876 (or 837 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 1224021856 is about 34986.0237237672. The cubic root of 1224021856 is about 1069.7026151166.

The spelling of 1224021856 in words is "one billion, two hundred twenty-four million, twenty-one thousand, eight hundred fifty-six".