209489 has 4 divisors (see below), whose sum is σ = 239424. Its totient is φ = 179556.

The previous prime is 209477. The next prime is 209497. The reversal of 209489 is 984902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 209489 - 2⁸ = 209233 is a prime.

It is a super-2 number, since 2×209489² = 87771282242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209449) 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, 14957 + ... + 14970.

It is an arithmetic number, because the mean of its divisors is an integer number (59856).

2²⁰⁹⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

209489 is a deficient number, since it is larger than the sum of its proper divisors (29935).

209489 is an equidigital number, since it uses as much as digits as its factorization.

209489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29934.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 209489 is about 457.6996831985. The cubic root of 209489 is about 59.3909685582.

It can be divided in two parts, 209 and 489, that multiplied together give a palindrome (102201).

The spelling of 209489 in words is "two hundred nine thousand, four hundred eighty-nine".