1223616 has 28 divisors (see below), whose sum is σ = 3237992. Its totient is φ = 407808.

The previous prime is 1223603. The next prime is 1223633. The reversal of 1223616 is 6163221.

It is a happy number.

It is a super-2 number, since 2×1223616² = 2994472230912, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1223592 and 1223601.

It is a congruent number.

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, 2995 + ... + 3378.

2^1223616 is an apocalyptic number.

1223616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1223616 is an abundant number, since it is smaller than the sum of its proper divisors (2014376).

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

1223616 is an equidigital number, since it uses as much as digits as its factorization.

1223616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6388 (or 6378 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

The square root of 1223616 is about 1106.1717768954. The cubic root of 1223616 is about 106.9584372888.

Adding to 1223616 its reverse (6163221), we get a palindrome (7386837).

The spelling of 1223616 in words is "one million, two hundred twenty-three thousand, six hundred sixteen".