1224223220 has 24 divisors (see below), whose sum is σ = 2804584608. Its totient is φ = 445172000.

The previous prime is 1224223211. The next prime is 1224223229. The reversal of 1224223220 is 223224221.

It is an interprime number because it is at equal distance from previous prime (1224223211) and next prime (1224223229).

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 = 1224223192 and 1224223201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224223229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2782106 + ... + 2782545.

It is an arithmetic number, because the mean of its divisors is an integer number (116857692).

Almost surely, 2^1224223220 is an apocalyptic number.

1224223220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1224223220 is an abundant number, since it is smaller than the sum of its proper divisors (1580361388).

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

1224223220 is a wasteful number, since it uses less digits than its factorization.

1224223220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5564671 (or 5564669 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1224223220 is about 34988.9013831529. The cubic root of 1224223220 is about 1069.7612708739.

Adding to 1224223220 its reverse (223224221), we get a palindrome (1447447441).

The spelling of 1224223220 in words is "one billion, two hundred twenty-four million, two hundred twenty-three thousand, two hundred twenty".