1224621 has 6 divisors (see below), whose sum is σ = 1768910. Its totient is φ = 816408.

The previous prime is 1224599. The next prime is 1224637. The reversal of 1224621 is 1264221.

It can be written as a sum of positive squares in only one way, i.e., 1022121 + 202500 = 1011^2 + 450^2 .

It is not a de Polignac number, because 1224621 - 2⁹ = 1224109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1224594 and 1224603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68026 + ... + 68043.

2^1224621 is an apocalyptic number.

It is an amenable number.

1224621 is a deficient number, since it is larger than the sum of its proper divisors (544289).

1224621 is a wasteful number, since it uses less digits than its factorization.

1224621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136075 (or 136072 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 1224621 is about 1106.6259530663. The cubic root of 1224621 is about 106.9877122175.

Adding to 1224621 its reverse (1264221), we get a palindrome (2488842).

The spelling of 1224621 in words is "one million, two hundred twenty-four thousand, six hundred twenty-one".