209390 has 8 divisors (see below), whose sum is σ = 376920. Its totient is φ = 83752.

The previous prime is 209381. The next prime is 209393. The reversal of 209390 is 93902.

209390 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209393) by changing a digit.

209390 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10460 + ... + 10479.

It is an arithmetic number, because the mean of its divisors is an integer number (47115).

2²⁰⁹³⁹⁰ is an apocalyptic number.

209390 is a deficient number, since it is larger than the sum of its proper divisors (167530).

209390 is a wasteful number, since it uses less digits than its factorization.

209390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20946.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 209390 is about 457.5915209005. The cubic root of 209390 is about 59.3816114521.

The spelling of 209390 in words is "two hundred nine thousand, three hundred ninety".