869643 has 16 divisors (see below), whose sum is σ = 1331200. Its totient is φ = 560520.

The previous prime is 869599. The next prime is 869657. The reversal of 869643 is 346968.

869643 is a `hidden beast` number, since 8 + 6 + 9 + 643 = 666.

It is not a de Polignac number, because 869643 - 2⁶ = 869579 is a prime.

It is a Duffinian number.

869643 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 869598 and 869607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869663) 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, 318 + ... + 1356.

It is an arithmetic number, because the mean of its divisors is an integer number (83200).

2⁸⁶⁹⁶⁴³ is an apocalyptic number.

869643 is a deficient number, since it is larger than the sum of its proper divisors (461557).

869643 is a wasteful number, since it uses less digits than its factorization.

869643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079 (or 1073 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 869643 is about 932.5465135852. The cubic root of 869643 is about 95.4509675839.

The spelling of 869643 in words is "eight hundred sixty-nine thousand, six hundred forty-three".