812943 has 8 divisors (see below), whose sum is σ = 1204400. Its totient is φ = 541944.

The previous prime is 812939. The next prime is 812963. The reversal of 812943 is 349218.

It is not a de Polignac number, because 812943 - 2² = 812939 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 30109 = 812943 / (8 + 1 + 2 + 9 + 4 + 3).

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a zygodrome in base 2.

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 812943.

It is not an unprimeable number, because it can be changed into a prime (812963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15028 + ... + 15081.

It is an arithmetic number, because the mean of its divisors is an integer number (150550).

2⁸¹²⁹⁴³ is an apocalyptic number.

812943 is a deficient number, since it is larger than the sum of its proper divisors (391457).

812943 is a wasteful number, since it uses less digits than its factorization.

812943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30118 (or 30112 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 812943 is about 901.6335175669. The cubic root of 812943 is about 93.3297348386.

The spelling of 812943 in words is "eight hundred twelve thousand, nine hundred forty-three".