209748 has 48 divisors (see below), whose sum is σ = 612864. Its totient is φ = 54240.

The previous prime is 209743. The next prime is 209767. The reversal of 209748 is 847902.

209748 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 811 + ... + 1037.

It is an arithmetic number, because the mean of its divisors is an integer number (12768).

2²⁰⁹⁷⁴⁸ is an apocalyptic number.

209748 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (306432).

209748 is an abundant number, since it is smaller than the sum of its proper divisors (403116).

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

209748 is a wasteful number, since it uses less digits than its factorization.

209748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 209748 is about 457.9825324180. The cubic root of 209748 is about 59.4154343232.

It can be divided in two parts, 2097 and 48, that added together give a triangular number (2145 = T₆₅).

The spelling of 209748 in words is "two hundred nine thousand, seven hundred forty-eight".