523989 has 10 divisors (see below), whose sum is σ = 782870. Its totient is φ = 349272.

The previous prime is 523987. The next prime is 523997. The reversal of 523989 is 989325.

It can be written as a sum of positive squares in only one way, i.e., 321489 + 202500 = 567^2 + 450^2 .

It is not a de Polignac number, because 523989 - 2¹ = 523987 is a prime.

It is a Duffinian number.

It is a Curzon number.

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 (523987) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3154 + ... + 3315.

It is an arithmetic number, because the mean of its divisors is an integer number (78287).

2⁵²³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

523989 is a deficient number, since it is larger than the sum of its proper divisors (258881).

523989 is an equidigital number, since it uses as much as digits as its factorization.

523989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6481 (or 6472 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 523989 is about 723.8708448335. The cubic root of 523989 is about 80.6196156491.

The spelling of 523989 in words is "five hundred twenty-three thousand, nine hundred eighty-nine".