1040809 has 12 divisors (see below), whose sum is σ = 1321488. Its totient is φ = 810600.

The previous prime is 1040807. The next prime is 1040813. The reversal of 1040809 is 9080401.

It is not a de Polignac number, because 1040809 - 2¹ = 1040807 is a prime.

1040809 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1040809.

It is not an unprimeable number, because it can be changed into a prime (1040803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 427 + ... + 1504.

It is an arithmetic number, because the mean of its divisors is an integer number (110124).

2^1040809 is an apocalyptic number.

It is an amenable number.

1040809 is a deficient number, since it is larger than the sum of its proper divisors (280679).

1040809 is a wasteful number, since it uses less digits than its factorization.

1040809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956 (or 1949 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1040809 is about 1020.2004704959. The cubic root of 1040809 is about 101.3422042769.

It can be divided in two parts, 1040 and 809, that added together give a square (1849 = 43²).

The spelling of 1040809 in words is "one million, forty thousand, eight hundred nine".