1223404220 has 24 divisors (see below), whose sum is σ = 2571884784. Its totient is φ = 488840576.

The previous prime is 1223404183. The next prime is 1223404253. The reversal of 1223404220 is 224043221.

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 = 1223404192 and 1223404201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13034 + ... + 51153.

It is an arithmetic number, because the mean of its divisors is an integer number (107161866).

Almost surely, 2^1223404220 is an apocalyptic number.

1223404220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223404220 is an abundant number, since it is smaller than the sum of its proper divisors (1348480564).

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

1223404220 is a wasteful number, since it uses less digits than its factorization.

1223404220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65149 (or 65147 counting only the distinct ones).

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

The square root of 1223404220 is about 34977.1957137790. The cubic root of 1223404220 is about 1069.5226624470.

Adding to 1223404220 its reverse (224043221), we get a palindrome (1447447441).

The spelling of 1223404220 in words is "one billion, two hundred twenty-three million, four hundred four thousand, two hundred twenty".