2148809 has 4 divisors (see below), whose sum is σ = 2314116. Its totient is φ = 1983504.

The previous prime is 2148803. The next prime is 2148857. The reversal of 2148809 is 9088412.

It is a happy number.

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 1056784 + 1092025 = 1028^2 + 1045^2 .

It is a cyclic number.

It is not a de Polignac number, because 2148809 - 2¹² = 2144713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2148803) 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, 82634 + ... + 82659.

It is an arithmetic number, because the mean of its divisors is an integer number (578529).

2^2148809 is an apocalyptic number.

It is an amenable number.

2148809 is a deficient number, since it is larger than the sum of its proper divisors (165307).

2148809 is a wasteful number, since it uses less digits than its factorization.

2148809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165306.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 2148809 is about 1465.8816459728. The cubic root of 2148809 is about 129.0424514252.

The spelling of 2148809 in words is "two million, one hundred forty-eight thousand, eight hundred nine".