| Base | Representation |
|---|---|
| bin | 100100011101000… |
| … | …1100000101101100 |
| 3 | 10011020200200100202 |
| 4 | 1020322030011230 |
| 5 | 10001120312140 |
| 6 | 321213413032 |
| 7 | 42212066612 |
| oct | 11072140554 |
| 9 | 3136620322 |
| 10 | 1223213420 |
| 11 | 578521390 |
| 12 | 2a179a178 |
| 13 | 166561430 |
| 14 | b86536b2 |
| 15 | 725c3915 |
| hex | 48e8c16c |
1223213420 has 96 divisors (see below), whose sum is σ = 3033628416. Its totient is φ = 408441600.
The previous prime is 1223213363. The next prime is 1223213437. The reversal of 1223213420 is 243123221.
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 = 1223213392 and 1223213401.
It is an unprimeable number.
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 31 ways as a sum of consecutive naturals, for example, 602447 + ... + 604473.
It is an arithmetic number, because the mean of its divisors is an integer number (31600296).
Almost surely, 21223213420 is an apocalyptic number.
1223213420 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 1223213420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1516814208).
1223213420 is an abundant number, since it is smaller than the sum of its proper divisors (1810414996).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1223213420 is a wasteful number, since it uses less digits than its factorization.
1223213420 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2271 (or 2269 counting only the distinct ones).
The product of its (nonzero) digits is 576, while the sum is 20.
The square root of 1223213420 is about 34974.4681160415. The cubic root of 1223213420 is about 1069.4670592565.
Adding to 1223213420 its reverse (243123221), we get a palindrome (1466336641).
It can be divided in two parts, 12232 and 13420, that added together give a palindrome (25652).
The spelling of 1223213420 in words is "one billion, two hundred twenty-three million, two hundred thirteen thousand, four hundred twenty".
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