823613 has 4 divisors (see below), whose sum is σ = 941280. Its totient is φ = 705948.

The previous prime is 823601. The next prime is 823619. The reversal of 823613 is 316328.

823613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 823613 - 2⁸ = 823357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58823 + ... + 58836.

It is an arithmetic number, because the mean of its divisors is an integer number (235320).

2⁸²³⁶¹³ is an apocalyptic number.

It is an amenable number.

823613 is a deficient number, since it is larger than the sum of its proper divisors (117667).

823613 is a wasteful number, since it uses less digits than its factorization.

823613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117666.

The product of its digits is 864, while the sum is 23.

The square root of 823613 is about 907.5312666790. The cubic root of 823613 is about 93.7362836229.

The spelling of 823613 in words is "eight hundred twenty-three thousand, six hundred thirteen".