812305 has 8 divisors (see below), whose sum is σ = 1049832. Its totient is φ = 599808.

The previous prime is 812299. The next prime is 812309. The reversal of 812305 is 503218.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16641 + 795664 = 129^2 + 892^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 812305 - 2³ = 812297 is a prime.

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

It is a Duffinian number.

812305 is a lucky number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (812309) 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, 6184 + ... + 6313.

It is an arithmetic number, because the mean of its divisors is an integer number (131229).

2⁸¹²³⁰⁵ is an apocalyptic number.

It is an amenable number.

812305 is a deficient number, since it is larger than the sum of its proper divisors (237527).

812305 is a wasteful number, since it uses less digits than its factorization.

812305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12515.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 812305 is about 901.2796458370. The cubic root of 812305 is about 93.3053133008.

The spelling of 812305 in words is "eight hundred twelve thousand, three hundred five".