869813 has 8 divisors (see below), whose sum is σ = 1002432. Its totient is φ = 739296.

The previous prime is 869809. The next prime is 869819. The reversal of 869813 is 318968.

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 869813 - 2² = 869809 is a prime.

It is a Duffinian number.

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 869813.

It is not an unprimeable number, because it can be changed into a prime (869819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506 + ... + 1412.

It is an arithmetic number, because the mean of its divisors is an integer number (125304).

2⁸⁶⁹⁸¹³ is an apocalyptic number.

It is an amenable number.

869813 is a deficient number, since it is larger than the sum of its proper divisors (132619).

869813 is a wasteful number, since it uses less digits than its factorization.

869813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051.

The product of its digits is 10368, while the sum is 35.

The square root of 869813 is about 932.6376573997. The cubic root of 869813 is about 95.4571868437.

The spelling of 869813 in words is "eight hundred sixty-nine thousand, eight hundred thirteen".