810745 has 8 divisors (see below), whose sum is σ = 1047816. Its totient is φ = 598656.

The previous prime is 810737. The next prime is 810757. The reversal of 810745 is 547018.

It can be written as a sum of positive squares in 4 ways, for example, as 41616 + 769129 = 204^2 + 877^2 .

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 810745 - 2³ = 810737 is a prime.

It is an Ulam number.

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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6172 + ... + 6301.

It is an arithmetic number, because the mean of its divisors is an integer number (130977).

2⁸¹⁰⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

810745 is a deficient number, since it is larger than the sum of its proper divisors (237071).

810745 is a wasteful number, since it uses less digits than its factorization.

810745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12491.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 810745 is about 900.4137937637. The cubic root of 810745 is about 93.2455452881.

The spelling of 810745 in words is "eight hundred ten thousand, seven hundred forty-five".