873813 has 4 divisors (see below), whose sum is σ = 1165088. Its totient is φ = 582540.

The previous prime is 873787. The next prime is 873863. The reversal of 873813 is 318378.

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 873813 - 2⁵ = 873781 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 4 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (873863) 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 3 ways as a sum of consecutive naturals, for example, 145633 + ... + 145638.

It is an arithmetic number, because the mean of its divisors is an integer number (291272).

2⁸⁷³⁸¹³ is an apocalyptic number.

It is an amenable number.

873813 is a deficient number, since it is larger than the sum of its proper divisors (291275).

873813 is a wasteful number, since it uses less digits than its factorization.

873813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291274.

The product of its digits is 4032, while the sum is 30.

The square root of 873813 is about 934.7796531804. The cubic root of 873813 is about 95.6032891033.

The spelling of 873813 in words is "eight hundred seventy-three thousand, eight hundred thirteen".