2009855 has 8 divisors (see below), whose sum is σ = 2516832. Its totient is φ = 1537888.

The previous prime is 2009831. The next prime is 2009857. The reversal of 2009855 is 5589002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2009855 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2009857) 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, 8624 + ... + 8853.

It is an arithmetic number, because the mean of its divisors is an integer number (314604).

2^2009855 is an apocalyptic number.

2009855 is a deficient number, since it is larger than the sum of its proper divisors (506977).

2009855 is a wasteful number, since it uses less digits than its factorization.

2009855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17505.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 2009855 is about 1417.6935493963. The cubic root of 2009855 is about 126.1987080471.

The spelling of 2009855 in words is "two million, nine thousand, eight hundred fifty-five".