523687 has 4 divisors (see below), whose sum is σ = 546480. Its totient is φ = 500896.

The previous prime is 523681. The next prime is 523717. The reversal of 523687 is 786325.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-523687 is a prime.

It is a super-3 number, since 3×523687³ = 430860453337811109, which contains 333 as substring.

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 an Ulam number.

523687 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523681) 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, 11362 + ... + 11407.

It is an arithmetic number, because the mean of its divisors is an integer number (136620).

2⁵²³⁶⁸⁷ is an apocalyptic number.

523687 is a deficient number, since it is larger than the sum of its proper divisors (22793).

523687 is a wasteful number, since it uses less digits than its factorization.

523687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22792.

The product of its digits is 10080, while the sum is 31.

The square root of 523687 is about 723.6622140198. The cubic root of 523687 is about 80.6041243551.

The spelling of 523687 in words is "five hundred twenty-three thousand, six hundred eighty-seven".