209673 has 6 divisors (see below), whose sum is σ = 302874. Its totient is φ = 139776.

The previous prime is 209669. The next prime is 209687. The reversal of 209673 is 376902.

It can be written as a sum of positive squares in only one way, i.e., 138384 + 71289 = 372^2 + 267^2 .

It is not a de Polignac number, because 209673 - 2² = 209669 is a prime.

It is not an unprimeable number, because it can be changed into a prime (209623) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11640 + ... + 11657.

It is an arithmetic number, because the mean of its divisors is an integer number (50479).

2²⁰⁹⁶⁷³ is an apocalyptic number.

It is an amenable number.

209673 is a deficient number, since it is larger than the sum of its proper divisors (93201).

209673 is a wasteful number, since it uses less digits than its factorization.

209673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23303 (or 23300 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 209673 is about 457.9006442450. The cubic root of 209673 is about 59.4083517148.

The spelling of 209673 in words is "two hundred nine thousand, six hundred seventy-three".