1228621 has 4 divisors (see below), whose sum is σ = 1237600. Its totient is φ = 1219644.

The previous prime is 1228613. The next prime is 1228631. The reversal of 1228621 is 1268221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1228621 - 2³ = 1228613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1228592 and 1228601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228631) 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 3 ways as a sum of consecutive naturals, for example, 4281 + ... + 4558.

It is an arithmetic number, because the mean of its divisors is an integer number (309400).

2^1228621 is an apocalyptic number.

It is an amenable number.

1228621 is a deficient number, since it is larger than the sum of its proper divisors (8979).

1228621 is an equidigital number, since it uses as much as digits as its factorization.

1228621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8978.

The product of its digits is 384, while the sum is 22.

The square root of 1228621 is about 1108.4317750768. The cubic root of 1228621 is about 107.1040708709.

It can be divided in two parts, 1228 and 621, that added together give a square (1849 = 43²).

The spelling of 1228621 in words is "one million, two hundred twenty-eight thousand, six hundred twenty-one".