1223816 has 16 divisors (see below), whose sum is σ = 2503440. Its totient is φ = 556240.

The previous prime is 1223777. The next prime is 1223857. The reversal of 1223816 is 6183221.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 1223791 and 1223800.

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, 6866 + ... + 7041.

It is an arithmetic number, because the mean of its divisors is an integer number (156465).

2^1223816 is an apocalyptic number.

It is an amenable number.

1223816 is an abundant number, since it is smaller than the sum of its proper divisors (1279624).

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

1223816 is a wasteful number, since it uses less digits than its factorization.

1223816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13924 (or 13920 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

The square root of 1223816 is about 1106.2621750742. The cubic root of 1223816 is about 106.9642644225.

The spelling of 1223816 in words is "one million, two hundred twenty-three thousand, eight hundred sixteen".