8199891 has 24 divisors (see below), whose sum is σ = 14127360. Its totient is φ = 4481136.

The previous prime is 8199883. The next prime is 8199901. The reversal of 8199891 is 1989918.

It is not a de Polignac number, because 8199891 - 2³ = 8199883 is a prime.

8199891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8199091) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1381 + ... + 4278.

It is an arithmetic number, because the mean of its divisors is an integer number (588640).

Almost surely, 2^8199891 is an apocalyptic number.

8199891 is a deficient number, since it is larger than the sum of its proper divisors (5927469).

8199891 is a wasteful number, since it uses less digits than its factorization.

8199891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5695 (or 5692 counting only the distinct ones).

The product of its digits is 46656, while the sum is 45.

The square root of 8199891 is about 2863.5451803665. The cubic root of 8199891 is about 201.6520740149.

The spelling of 8199891 in words is "eight million, one hundred ninety-nine thousand, eight hundred ninety-one".