2009891 has 8 divisors (see below), whose sum is σ = 2175600. Its totient is φ = 1845792.

The previous prime is 2009881. The next prime is 2009897. The reversal of 2009891 is 1989002.

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

It is not a de Polignac number, because 2009891 - 2⁶ = 2009827 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2009897) 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, 4316 + ... + 4758.

It is an arithmetic number, because the mean of its divisors is an integer number (271950).

2^2009891 is an apocalyptic number.

2009891 is a deficient number, since it is larger than the sum of its proper divisors (165709).

2009891 is a wasteful number, since it uses less digits than its factorization.

2009891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 2009891 is about 1417.7062460185. The cubic root of 2009891 is about 126.1994615221.

The spelling of 2009891 in words is "two million, nine thousand, eight hundred ninety-one".