1223200818 has 96 divisors (see below), whose sum is σ = 3190777920. Its totient is φ = 346308480.

The previous prime is 1223200817. The next prime is 1223200861. The reversal of 1223200818 is 8180023221.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1223200791 and 1223200800.

It is not an unprimeable number, because it can be changed into a prime (1223200817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 296953 + ... + 301043.

It is an arithmetic number, because the mean of its divisors is an integer number (33237270).

Almost surely, 2^1223200818 is an apocalyptic number.

1223200818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1223200818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1595388960).

1223200818 is an abundant number, since it is smaller than the sum of its proper divisors (1967577102).

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

1223200818 is a wasteful number, since it uses less digits than its factorization.

1223200818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4229 (or 4216 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 1223200818 is about 34974.2879555825. The cubic root of 1223200818 is about 1069.4633865613.

The spelling of 1223200818 in words is "one billion, two hundred twenty-three million, two hundred thousand, eight hundred eighteen".