243906 has 32 divisors (see below), whose sum is σ = 544320. Its totient is φ = 72384.

The previous prime is 243889. The next prime is 243911. The reversal of 243906 is 609342.

243906 = 33² + 34² + ... + 91².

243906 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 an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4105 + ... + 4163.

It is an arithmetic number, because the mean of its divisors is an integer number (17010).

2²⁴³⁹⁰⁶ is an apocalyptic number.

243906 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 243906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272160).

243906 is an abundant number, since it is smaller than the sum of its proper divisors (300414).

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

243906 is a wasteful number, since it uses less digits than its factorization.

243906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 243906 is about 493.8684035247. The cubic root of 243906 is about 62.4799722496.

The spelling of 243906 in words is "two hundred forty-three thousand, nine hundred six".