1228811 has 12 divisors (see below), whose sum is σ = 1364616. Its totient is φ = 1102080.

The previous prime is 1228789. The next prime is 1228837. The reversal of 1228811 is 1188221.

It is a happy number.

It is not a de Polignac number, because 1228811 - 2¹⁴ = 1212427 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28556 + ... + 28598.

It is an arithmetic number, because the mean of its divisors is an integer number (113718).

2^1228811 is an apocalyptic number.

1228811 is a deficient number, since it is larger than the sum of its proper divisors (135805).

1228811 is an equidigital number, since it uses as much as digits as its factorization.

1228811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 101 counting only the distinct ones).

The product of its digits is 256, while the sum is 23.

The square root of 1228811 is about 1108.5174784369. The cubic root of 1228811 is about 107.1095916199.

The spelling of 1228811 in words is "one million, two hundred twenty-eight thousand, eight hundred eleven".