523966 has 4 divisors (see below), whose sum is σ = 785952. Its totient is φ = 261982.

The previous prime is 523949. The next prime is 523969. The reversal of 523966 is 669325.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 (523969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130990 + ... + 130993.

It is an arithmetic number, because the mean of its divisors is an integer number (196488).

2⁵²³⁹⁶⁶ is an apocalyptic number.

523966 is a deficient number, since it is larger than the sum of its proper divisors (261986).

523966 is a wasteful number, since it uses less digits than its factorization.

523966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261985.

The product of its digits is 9720, while the sum is 31.

The square root of 523966 is about 723.8549578472. The cubic root of 523966 is about 80.6184360580.

The spelling of 523966 in words is "five hundred twenty-three thousand, nine hundred sixty-six".