812729 has 4 divisors (see below), whose sum is σ = 816000. Its totient is φ = 809460.

The previous prime is 812717. The next prime is 812731. The reversal of 812729 is 927218.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 812729 - 2⁸ = 812473 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812759) 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, 1229 + ... + 1770.

It is an arithmetic number, because the mean of its divisors is an integer number (204000).

2⁸¹²⁷²⁹ is an apocalyptic number.

It is an amenable number.

812729 is a deficient number, since it is larger than the sum of its proper divisors (3271).

812729 is a wasteful number, since it uses less digits than its factorization.

812729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3270.

The product of its digits is 2016, while the sum is 29.

The square root of 812729 is about 901.5148362617. The cubic root of 812729 is about 93.3215447129.

The spelling of 812729 in words is "eight hundred twelve thousand, seven hundred twenty-nine".