2104409 has 4 divisors (see below), whose sum is σ = 2112180. Its totient is φ = 2096640.

The previous prime is 2104397. The next prime is 2104423. The reversal of 2104409 is 9044012.

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 1243225 + 861184 = 1115^2 + 928^2 .

It is a cyclic number.

It is not a de Polignac number, because 2104409 - 2¹² = 2100313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2104499) 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, 3464 + ... + 4025.

It is an arithmetic number, because the mean of its divisors is an integer number (528045).

2^2104409 is an apocalyptic number.

It is an amenable number.

2104409 is a deficient number, since it is larger than the sum of its proper divisors (7771).

2104409 is an equidigital number, since it uses as much as digits as its factorization.

2104409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7770.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 2104409 is about 1450.6581265067. The cubic root of 2104409 is about 128.1474740668.

The spelling of 2104409 in words is "two million, one hundred four thousand, four hundred nine".