849891 has 8 divisors (see below), whose sum is σ = 1295104. Its totient is φ = 485640.

The previous prime is 849883. The next prime is 849917. The reversal of 849891 is 198948.

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

It is not a de Polignac number, because 849891 - 2³ = 849883 is a prime.

It is a Duffinian number.

849891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (849391) 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, 20215 + ... + 20256.

It is an arithmetic number, because the mean of its divisors is an integer number (161888).

2⁸⁴⁹⁸⁹¹ is an apocalyptic number.

849891 is a deficient number, since it is larger than the sum of its proper divisors (445213).

849891 is a wasteful number, since it uses less digits than its factorization.

849891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40481.

The product of its digits is 20736, while the sum is 39.

The square root of 849891 is about 921.8953302843. The cubic root of 849891 is about 94.7227744381.

The spelling of 849891 in words is "eight hundred forty-nine thousand, eight hundred ninety-one".