523999 has 4 divisors (see below), whose sum is σ = 598864. Its totient is φ = 449136.

The previous prime is 523997. The next prime is 524047. The reversal of 523999 is 999325.

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

It is a cyclic number.

It is not a de Polignac number, because 523999 - 2¹ = 523997 is a prime.

523999 is a modest number, since divided by 999 gives 523 as remainder.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37422 + ... + 37435.

It is an arithmetic number, because the mean of its divisors is an integer number (149716).

2⁵²³⁹⁹⁹ is an apocalyptic number.

523999 is a deficient number, since it is larger than the sum of its proper divisors (74865).

523999 is an equidigital number, since it uses as much as digits as its factorization.

523999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74864.

The product of its digits is 21870, while the sum is 37.

The square root of 523999 is about 723.8777521101. The cubic root of 523999 is about 80.6201285040.

The spelling of 523999 in words is "five hundred twenty-three thousand, nine hundred ninety-nine".