2180409 has 16 divisors (see below), whose sum is σ = 3624960. Its totient is φ = 1132560.

The previous prime is 2180393. The next prime is 2180417. The reversal of 2180409 is 9040812.

It is not a de Polignac number, because 2180409 - 2⁴ = 2180393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2184409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4489 + ... + 4950.

It is an arithmetic number, because the mean of its divisors is an integer number (226560).

2^2180409 is an apocalyptic number.

It is an amenable number.

2180409 is a deficient number, since it is larger than the sum of its proper divisors (1444551).

2180409 is a wasteful number, since it uses less digits than its factorization.

2180409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9460.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 2180409 is about 1476.6208044044. The cubic root of 2180409 is about 129.6719341360.

The spelling of 2180409 in words is "two million, one hundred eighty thousand, four hundred nine".