812143 has 4 divisors (see below), whose sum is σ = 813960. Its totient is φ = 810328.

The previous prime is 812137. The next prime is 812167. The reversal of 812143 is 341218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 341218 = 2 ⋅170609.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-812143 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 812143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812173) 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, 288 + ... + 1306.

It is an arithmetic number, because the mean of its divisors is an integer number (203490).

2⁸¹²¹⁴³ is an apocalyptic number.

812143 is a deficient number, since it is larger than the sum of its proper divisors (1817).

812143 is a wasteful number, since it uses less digits than its factorization.

812143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1816.

The product of its digits is 192, while the sum is 19.

The square root of 812143 is about 901.1897691386. The cubic root of 812143 is about 93.2991101851.

The spelling of 812143 in words is "eight hundred twelve thousand, one hundred forty-three".