523865 has 4 divisors (see below), whose sum is σ = 628644. Its totient is φ = 419088.

The previous prime is 523847. The next prime is 523867. The reversal of 523865 is 568325.

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 373321 + 150544 = 611^2 + 388^2 .

It is a cyclic number.

It is not a de Polignac number, because 523865 - 2⁶ = 523801 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (523867) 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, 52382 + ... + 52391.

It is an arithmetic number, because the mean of its divisors is an integer number (157161).

2⁵²³⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

523865 is a deficient number, since it is larger than the sum of its proper divisors (104779).

523865 is a wasteful number, since it uses less digits than its factorization.

523865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104778.

The product of its digits is 7200, while the sum is 29.

The square root of 523865 is about 723.7851891273. The cubic root of 523865 is about 80.6132557058.

The spelling of 523865 in words is "five hundred twenty-three thousand, eight hundred sixty-five".