209949 has 8 divisors (see below), whose sum is σ = 286080. Its totient is φ = 136896.

The previous prime is 209939. The next prime is 209953. The reversal of 209949 is 949902.

It is a happy number.

209949 is digitally balanced in base 2, 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 not a de Polignac number, because 209949 - 2⁵ = 209917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 604 + ... + 885.

It is an arithmetic number, because the mean of its divisors is an integer number (35760).

2²⁰⁹⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

209949 is a deficient number, since it is larger than the sum of its proper divisors (76131).

209949 is a wasteful number, since it uses less digits than its factorization.

209949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 209949 is about 458.2019205547. The cubic root of 209949 is about 59.4344073917.

The spelling of 209949 in words is "two hundred nine thousand, nine hundred forty-nine".