812643 has 16 divisors (see below), whose sum is σ = 1188096. Its totient is φ = 491040.

The previous prime is 812641. The next prime is 812671. The reversal of 812643 is 346218.

It is a happy number.

812643 is nontrivially palindromic in base 2.

812643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 812643 - 2¹ = 812641 is a prime.

It is a nialpdrome in base 16.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (812641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2458 + ... + 2768.

It is an arithmetic number, because the mean of its divisors is an integer number (74256).

2⁸¹²⁶⁴³ is an apocalyptic number.

812643 is a deficient number, since it is larger than the sum of its proper divisors (375453).

812643 is a wasteful number, since it uses less digits than its factorization.

812643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394.

The product of its digits is 1152, while the sum is 24.

The square root of 812643 is about 901.4671375042. The cubic root of 812643 is about 93.3182529490.

The spelling of 812643 in words is "eight hundred twelve thousand, six hundred forty-three".