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BaseRepresentation
bin100101010101000110100
32022010221110
410222220310
5303120340
642115020
713253145
oct4525064
92263843
101223220
11766029
124aba70
1333a9cb
1423bacc
15192680
hex12aa34

1223220 has 96 divisors (see below), whose sum is σ = 3830400. Its totient is φ = 290304.

The previous prime is 1223207. The next prime is 1223231. The reversal of 1223220 is 223221.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1223196 and 1223205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33042 + ... + 33078.

It is an arithmetic number, because the mean of its divisors is an integer number (39900).

21223220 is an apocalyptic number.

1223220 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 1223220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1915200).

1223220 is an abundant number, since it is smaller than the sum of its proper divisors (2607180).

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

1223220 is a wasteful number, since it uses less digits than its factorization.

1223220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 1223220 is about 1105.9927667033. The cubic root of 1223220 is about 106.9468976905.

Adding to 1223220 its reverse (223221), we get a palindrome (1446441).

Subtracting from 1223220 its reverse (223221), we obtain a palindrome (999999).

It can be divided in two parts, 12 and 23220, that added together give a palindrome (23232).

The spelling of 1223220 in words is "one million, two hundred twenty-three thousand, two hundred twenty".