209493 has 8 divisors (see below), whose sum is σ = 310400. Its totient is φ = 139644.

The previous prime is 209477. The next prime is 209497. The reversal of 209493 is 394902.

209493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 209493 - 2⁴ = 209477 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 7759 = 209493 / (2 + 0 + 9 + 4 + 9 + 3).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209497) 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, 3853 + ... + 3906.

It is an arithmetic number, because the mean of its divisors is an integer number (38800).

2²⁰⁹⁴⁹³ is an apocalyptic number.

It is an amenable number.

209493 is a deficient number, since it is larger than the sum of its proper divisors (100907).

209493 is an equidigital number, since it uses as much as digits as its factorization.

209493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7768 (or 7762 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 209493 is about 457.7040528551. The cubic root of 209493 is about 59.3913465611.

It can be divided in two parts, 2094 and 93, that added together give a 7-th power (2187 = 3⁷).

The spelling of 209493 in words is "two hundred nine thousand, four hundred ninety-three".