869847 has 16 divisors (see below), whose sum is σ = 1296768. Its totient is φ = 514080.

The previous prime is 869819. The next prime is 869849. The reversal of 869847 is 748968.

It is a happy number.

It is not a de Polignac number, because 869847 - 2¹² = 865751 is a prime.

It is an Ulam number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 869799 and 869808.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 869847.

It is not an unprimeable number, because it can be changed into a prime (869849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1113 + ... + 1725.

It is an arithmetic number, because the mean of its divisors is an integer number (81048).

2⁸⁶⁹⁸⁴⁷ is an apocalyptic number.

869847 is a deficient number, since it is larger than the sum of its proper divisors (426921).

869847 is a wasteful number, since it uses less digits than its factorization.

869847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670.

The product of its digits is 96768, while the sum is 42.

The square root of 869847 is about 932.6558850937. The cubic root of 869847 is about 95.4584305984.

The spelling of 869847 in words is "eight hundred sixty-nine thousand, eight hundred forty-seven".