1140809 has 4 divisors (see below), whose sum is σ = 1157904. Its totient is φ = 1123716.

The previous prime is 1140803. The next prime is 1140847. The reversal of 1140809 is 9080411.

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 not a de Polignac number, because 1140809 - 2²⁰ = 92233 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1140803) 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, 8447 + ... + 8580.

It is an arithmetic number, because the mean of its divisors is an integer number (289476).

2^1140809 is an apocalyptic number.

It is an amenable number.

1140809 is a deficient number, since it is larger than the sum of its proper divisors (17095).

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 product of its (nonzero) digits is 288, while the sum is 23.

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".