827813 has 4 divisors (see below), whose sum is σ = 946080. Its totient is φ = 709548.

The previous prime is 827809. The next prime is 827821. The reversal of 827813 is 318728.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 827813 - 2² = 827809 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (827803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59123 + ... + 59136.

It is an arithmetic number, because the mean of its divisors is an integer number (236520).

2⁸²⁷⁸¹³ is an apocalyptic number.

It is an amenable number.

827813 is a deficient number, since it is larger than the sum of its proper divisors (118267).

827813 is a wasteful number, since it uses less digits than its factorization.

827813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118266.

The product of its digits is 2688, while the sum is 29.

The square root of 827813 is about 909.8422940268. The cubic root of 827813 is about 93.8953490544.

The spelling of 827813 in words is "eight hundred twenty-seven thousand, eight hundred thirteen".