209648 has 10 divisors (see below), whose sum is σ = 406224. Its totient is φ = 104816.

The previous prime is 209647. The next prime is 209659. The reversal of 209648 is 846902.

209648 = T₁₂ + T₁₃ + ... + T₁₀₇.

209648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 209648.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6536 + ... + 6567.

2²⁰⁹⁶⁴⁸ is an apocalyptic number.

It is an amenable number.

209648 is a deficient number, since it is larger than the sum of its proper divisors (196576).

209648 is a wasteful number, since it uses less digits than its factorization.

209648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13111 (or 13105 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 209648 is about 457.8733449329. The cubic root of 209648 is about 59.4059904701.

The spelling of 209648 in words is "two hundred nine thousand, six hundred forty-eight".