823505 has 4 divisors (see below), whose sum is σ = 988212. Its totient is φ = 658800.

The previous prime is 823499. The next prime is 823519. The reversal of 823505 is 505328.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 614656 + 208849 = 784^2 + 457^2 .

It is not a de Polignac number, because 823505 - 2⁴ = 823489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82346 + ... + 82355.

It is an arithmetic number, because the mean of its divisors is an integer number (247053).

2⁸²³⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

823505 is a deficient number, since it is larger than the sum of its proper divisors (164707).

823505 is a wasteful number, since it uses less digits than its factorization.

823505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164706.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 823505 is about 907.4717626461. The cubic root of 823505 is about 93.7321862450.

The spelling of 823505 in words is "eight hundred twenty-three thousand, five hundred five".