869891 has 8 divisors (see below), whose sum is σ = 979968. Its totient is φ = 765000.

The previous prime is 869887. The next prime is 869893. The reversal of 869891 is 198968.

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 869891 - 2² = 869887 is a prime.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 869891.

It is not an unprimeable number, because it can be changed into a prime (869893) 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, 935 + ... + 1616.

It is an arithmetic number, because the mean of its divisors is an integer number (122496).

2⁸⁶⁹⁸⁹¹ is an apocalyptic number.

869891 is a deficient number, since it is larger than the sum of its proper divisors (110077).

869891 is a wasteful number, since it uses less digits than its factorization.

869891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2593.

The product of its digits is 31104, while the sum is 41.

The square root of 869891 is about 932.6794733455. The cubic root of 869891 is about 95.4600401152.

The spelling of 869891 in words is "eight hundred sixty-nine thousand, eight hundred ninety-one".