810945 has 16 divisors (see below), whose sum is σ = 1441920. Its totient is φ = 432432.

The previous prime is 810941. The next prime is 810949. The reversal of 810945 is 549018.

It is an interprime number because it is at equal distance from previous prime (810941) and next prime (810949).

It is not a de Polignac number, because 810945 - 2² = 810941 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 810945.

It is not an unprimeable number, because it can be changed into a prime (810941) 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 15 ways as a sum of consecutive naturals, for example, 2869 + ... + 3138.

It is an arithmetic number, because the mean of its divisors is an integer number (90120).

2⁸¹⁰⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

810945 is a deficient number, since it is larger than the sum of its proper divisors (630975).

810945 is a wasteful number, since it uses less digits than its factorization.

810945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6021 (or 6015 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 810945 is about 900.5248469643. The cubic root of 810945 is about 93.2532121360.

The spelling of 810945 in words is "eight hundred ten thousand, nine hundred forty-five".