209434 has 4 divisors (see below), whose sum is σ = 314154. Its totient is φ = 104716.

The previous prime is 209431. The next prime is 209441. The reversal of 209434 is 434902.

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

It can be written as a sum of positive squares in only one way, i.e., 205209 + 4225 = 453^2 + 65^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (209431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52357 + ... + 52360.

2²⁰⁹⁴³⁴ is an apocalyptic number.

209434 is a deficient number, since it is larger than the sum of its proper divisors (104720).

209434 is a wasteful number, since it uses less digits than its factorization.

209434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104719.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 209434 is about 457.6395961890. The cubic root of 209434 is about 59.3857705300.

The spelling of 209434 in words is "two hundred nine thousand, four hundred thirty-four".