810445 has 12 divisors (see below), whose sum is σ = 1028700. Its totient is φ = 612864.

The previous prime is 810443. The next prime is 810457. The reversal of 810445 is 544018.

It can be written as a sum of positive squares in 2 ways, for example, as 393129 + 417316 = 627^2 + 646^2 .

It is not a de Polignac number, because 810445 - 2¹ = 810443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1581 + ... + 2029.

It is an arithmetic number, because the mean of its divisors is an integer number (85725).

2⁸¹⁰⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

810445 is a deficient number, since it is larger than the sum of its proper divisors (218255).

810445 is a wasteful number, since it uses less digits than its factorization.

810445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492 (or 473 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 810445 is about 900.2471882766. The cubic root of 810445 is about 93.2340426518.

The spelling of 810445 in words is "eight hundred ten thousand, four hundred forty-five".