1006409 has 4 divisors (see below), whose sum is σ = 1008516. Its totient is φ = 1004304.

The previous prime is 1006393. The next prime is 1006433. The reversal of 1006409 is 9046001.

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 990025 + 16384 = 995^2 + 128^2 .

It is a cyclic number.

It is not a de Polignac number, because 1006409 - 2⁴ = 1006393 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 (1006469) 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, 47 + ... + 1419.

It is an arithmetic number, because the mean of its divisors is an integer number (252129).

2^1006409 is an apocalyptic number.

It is an amenable number.

1006409 is a deficient number, since it is larger than the sum of its proper divisors (2107).

1006409 is an equidigital number, since it uses as much as digits as its factorization.

1006409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106.

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

The square root of 1006409 is about 1003.1993819775. The cubic root of 1006409 is about 100.2131785594.

The spelling of 1006409 in words is "one million, six thousand, four hundred nine".