209442 has 16 divisors (see below), whose sum is σ = 425952. Its totient is φ = 68640.

The previous prime is 209441. The next prime is 209449. The reversal of 209442 is 244902.

209442 is nontrivially palindromic in base 5.

209442 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 16.

It is a zygodrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142 + ... + 662.

It is an arithmetic number, because the mean of its divisors is an integer number (26622).

2²⁰⁹⁴⁴² is an apocalyptic number.

209442 is an abundant number, since it is smaller than the sum of its proper divisors (216510).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209442 is a wasteful number, since it uses less digits than its factorization.

209442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 209442 is about 457.6483366079. The cubic root of 209442 is about 59.3865266633.

The spelling of 209442 in words is "two hundred nine thousand, four hundred forty-two".