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, and also an emirpimes, since its reverse is a distinct semiprime: 9080411 = 2713 ⋅3347.
It is a cyclic number.
It is a Duffinian number.
It is a Curzon number.
21140809 is an apocalyptic number.
It is an amenable number.
1140809 is an equidigital number, since it uses as much as digits as its factorization.
1140809 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 17094.
The square root of 1140809 is about 1068.0866069753. The cubic root of 1140809 is about 104.4890978607.
The spelling of 1140809 in words is "one million, one hundred forty thousand, eight hundred nine".