823145 has 8 divisors (see below), whose sum is σ = 994056. Its totient is φ = 654336.

The previous prime is 823129. The next prime is 823153. The reversal of 823145 is 541328.

It can be written as a sum of positive squares in 4 ways, for example, as 5929 + 817216 = 77^2 + 904^2 .

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 823145 - 2⁴ = 823129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 823145.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 539 + ... + 1391.

It is an arithmetic number, because the mean of its divisors is an integer number (124257).

2⁸²³¹⁴⁵ is an apocalyptic number.

It is an amenable number.

823145 is a deficient number, since it is larger than the sum of its proper divisors (170911).

823145 is a wasteful number, since it uses less digits than its factorization.

823145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051.

The product of its digits is 960, while the sum is 23.

The square root of 823145 is about 907.2733876842. The cubic root of 823145 is about 93.7185257308.

The spelling of 823145 in words is "eight hundred twenty-three thousand, one hundred forty-five".