1228809 has 16 divisors (see below), whose sum is σ = 1723904. Its totient is φ = 777600.

The previous prime is 1228789. The next prime is 1228837. The reversal of 1228809 is 9088221.

It is not a de Polignac number, because 1228809 - 2¹⁶ = 1163273 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1228849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6699 + ... + 6879.

It is an arithmetic number, because the mean of its divisors is an integer number (107744).

2^1228809 is an apocalyptic number.

It is an amenable number.

1228809 is a deficient number, since it is larger than the sum of its proper divisors (495095).

1228809 is a wasteful number, since it uses less digits than its factorization.

1228809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1228809 is about 1108.5165763307. The cubic root of 1228809 is about 107.1095335098.

The spelling of 1228809 in words is "one million, two hundred twenty-eight thousand, eight hundred nine".