1123409 has 12 divisors (see below), whose sum is σ = 1334592. Its totient is φ = 926280.

The previous prime is 1123403. The next prime is 1123427. The reversal of 1123409 is 9043211.

1123409 = T₂₂ + T₂₃ + ... + T₁₈₈.

It is a de Polignac number, because none of the positive numbers 2^k-1123409 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123403) 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, 6644 + ... + 6810.

It is an arithmetic number, because the mean of its divisors is an integer number (111216).

2^1123409 is an apocalyptic number.

It is an amenable number.

1123409 is a deficient number, since it is larger than the sum of its proper divisors (211183).

1123409 is an equidigital number, since it uses as much as digits as its factorization.

1123409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1123409 is about 1059.9099018313. The cubic root of 1123409 is about 103.9551396760.

The spelling of 1123409 in words is "one million, one hundred twenty-three thousand, four hundred nine".