523605 has 16 divisors (see below), whose sum is σ = 851904. Its totient is φ = 274560.

The previous prime is 523603. The next prime is 523631. The reversal of 523605 is 506325.

It is not a de Polignac number, because 523605 - 2¹ = 523603 is a prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 745 + ... + 1265.

It is an arithmetic number, because the mean of its divisors is an integer number (53244).

2⁵²³⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

523605 is a deficient number, since it is larger than the sum of its proper divisors (328299).

523605 is a wasteful number, since it uses less digits than its factorization.

523605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 523605 is about 723.6055555342. The cubic root of 523605 is about 80.5999170817.

Multiplying 523605 by its sum of digits (21), we get a triangular number (10995705 = T₄₆₈₉).

It can be divided in two parts, 523 and 605, that added together give a triangular number (1128 = T₄₇).

The spelling of 523605 in words is "five hundred twenty-three thousand, six hundred five".