2149809 has 8 divisors (see below), whose sum is σ = 2907072. Its totient is φ = 1412880.

The previous prime is 2149789. The next prime is 2149813. The reversal of 2149809 is 9089412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2149809 - 2⁷ = 2149681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2149809.

It is not an unprimeable number, because it can be changed into a prime (2149859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4834 + ... + 5259.

It is an arithmetic number, because the mean of its divisors is an integer number (363384).

2^2149809 is an apocalyptic number.

It is an amenable number.

2149809 is a deficient number, since it is larger than the sum of its proper divisors (757263).

2149809 is a wasteful number, since it uses less digits than its factorization.

2149809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10167.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 2149809 is about 1466.2226979555. Note that the first 3 decimals coincide. The cubic root of 2149809 is about 129.0624659913.

The spelling of 2149809 in words is "two million, one hundred forty-nine thousand, eight hundred nine".