208523 has 4 divisors (see below), whose sum is σ = 238320. Its totient is φ = 178728.

The previous prime is 208519. The next prime is 208529. The reversal of 208523 is 325802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325802 = 2 ⋅162901.

It is a cyclic number.

It is not a de Polignac number, because 208523 - 2² = 208519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 208495 and 208504.

It is not an unprimeable number, because it can be changed into a prime (208529) 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, 14888 + ... + 14901.

It is an arithmetic number, because the mean of its divisors is an integer number (59580).

2²⁰⁸⁵²³ is an apocalyptic number.

208523 is a deficient number, since it is larger than the sum of its proper divisors (29797).

208523 is an equidigital number, since it uses as much as digits as its factorization.

208523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29796.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 208523 is about 456.6431867443. The cubic root of 208523 is about 59.2995395941.

The spelling of 208523 in words is "two hundred eight thousand, five hundred twenty-three".