1223216 has 20 divisors (see below), whose sum is σ = 2399400. Its totient is φ = 604032.

The previous prime is 1223207. The next prime is 1223231. The reversal of 1223216 is 6123221.

1223216 = T₃₈₃ + T₃₈₄ + ... + T₃₉₈.

It is a junction number, because it is equal to n+sod(n) for n = 1223194 and 1223203.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 995 + ... + 1853.

It is an arithmetic number, because the mean of its divisors is an integer number (119970).

2^1223216 is an apocalyptic number.

1223216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1223216 is a deficient number, since it is larger than the sum of its proper divisors (1176184).

1223216 is an equidigital number, since it uses as much as digits as its factorization.

1223216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956 (or 950 counting only the distinct ones).

The product of its digits is 144, while the sum is 17.

The square root of 1223216 is about 1105.9909583717. The cubic root of 1223216 is about 106.9467811162.

Adding to 1223216 its reverse (6123221), we get a palindrome (7346437).

The spelling of 1223216 in words is "one million, two hundred twenty-three thousand, two hundred sixteen".