1223621 has 8 divisors (see below), whose sum is σ = 1419840. Its totient is φ = 1032768.

The previous prime is 1223603. The next prime is 1223633. The reversal of 1223621 is 1263221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1223621 - 2¹⁰ = 1222597 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1223621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 836 + ... + 1773.

It is an arithmetic number, because the mean of its divisors is an integer number (177480).

2^1223621 is an apocalyptic number.

It is an amenable number.

1223621 is a deficient number, since it is larger than the sum of its proper divisors (196219).

1223621 is an equidigital number, since it uses as much as digits as its factorization.

1223621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683.

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

The square root of 1223621 is about 1106.1740369399. The cubic root of 1223621 is about 106.9585829749.

Adding to 1223621 its reverse (1263221), we get a palindrome (2486842).

The spelling of 1223621 in words is "one million, two hundred twenty-three thousand, six hundred twenty-one".