2135809 has 8 divisors (see below), whose sum is σ = 2421440. Its totient is φ = 1867536.

The previous prime is 2135797. The next prime is 2135831. The reversal of 2135809 is 9085312.

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

It is a cyclic number.

It is not a de Polignac number, because 2135809 - 2¹³ = 2127617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2135909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4077 + ... + 4570.

It is an arithmetic number, because the mean of its divisors is an integer number (302680).

2^2135809 is an apocalyptic number.

It is an amenable number.

2135809 is a deficient number, since it is larger than the sum of its proper divisors (285631).

2135809 is a wasteful number, since it uses less digits than its factorization.

2135809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8679.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 2135809 is about 1461.4407275015. The cubic root of 2135809 is about 128.7816951534.

The spelling of 2135809 in words is "two million, one hundred thirty-five thousand, eight hundred nine".