243908 has 24 divisors (see below), whose sum is σ = 505344. Its totient is φ = 100800.

The previous prime is 243889. The next prime is 243911. The reversal of 243908 is 809342.

243908 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×243908² = 118982224928, which contains 22 as substring.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 243908.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 728 + ... + 1008.

It is an arithmetic number, because the mean of its divisors is an integer number (21056).

2²⁴³⁹⁰⁸ is an apocalyptic number.

243908 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 243908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252672).

243908 is an abundant number, since it is smaller than the sum of its proper divisors (261436).

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

243908 is a wasteful number, since it uses less digits than its factorization.

243908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 243908 is about 493.8704283514. The cubic root of 243908 is about 62.4801430252.

The spelling of 243908 in words is "two hundred forty-three thousand, nine hundred eight".