1224409 has 4 divisors (see below), whose sum is σ = 1266660. Its totient is φ = 1182160.

The previous prime is 1224403. The next prime is 1224413. The reversal of 1224409 is 9044221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 994009 + 230400 = 997^2 + 480^2 .

It is a cyclic number.

It is not a de Polignac number, because 1224409 - 2⁷ = 1224281 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

1224409 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1224409.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21082 + ... + 21139.

It is an arithmetic number, because the mean of its divisors is an integer number (316665).

2^1224409 is an apocalyptic number.

It is an amenable number.

1224409 is a deficient number, since it is larger than the sum of its proper divisors (42251).

1224409 is an equidigital number, since it uses as much as digits as its factorization.

1224409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42250.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1224409 is about 1106.5301622640. The cubic root of 1224409 is about 106.9815381430.

The spelling of 1224409 in words is "one million, two hundred twenty-four thousand, four hundred nine".