1409809 has 4 divisors (see below), whose sum is σ = 1417780. Its totient is φ = 1401840.

The previous prime is 1409803. The next prime is 1409833. The reversal of 1409809 is 9089041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9089041 = 13 ⋅699157.

It can be written as a sum of positive squares in 2 ways, for example, as 313600 + 1096209 = 560^2 + 1047^2 .

It is a cyclic number.

It is not a de Polignac number, because 1409809 - 2¹⁵ = 1377041 is a prime.

It is a super-2 number, since 2×1409809² = 3975122832962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1409803) 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, 3714 + ... + 4075.

It is an arithmetic number, because the mean of its divisors is an integer number (354445).

2^1409809 is an apocalyptic number.

It is an amenable number.

1409809 is a deficient number, since it is larger than the sum of its proper divisors (7971).

1409809 is an equidigital number, since it uses as much as digits as its factorization.

1409809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7970.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1409809 is about 1187.3537804715. The cubic root of 1409809 is about 112.1295535279.

The spelling of 1409809 in words is "one million, four hundred nine thousand, eight hundred nine".