243905920 has 32 divisors (see below), whose sum is σ = 583089120. Its totient is φ = 97562112.

The previous prime is 243905903. The next prime is 243905939. The reversal of 243905920 is 29509342.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×243905920² = 118980195622092800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189912 + ... + 191191.

It is an arithmetic number, because the mean of its divisors is an integer number (18221535).

Almost surely, 2^243905920 is an apocalyptic number.

243905920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243905920 is an abundant number, since it is smaller than the sum of its proper divisors (339183200).

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

243905920 is an equidigital number, since it uses as much as digits as its factorization.

243905920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381122 (or 381110 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 243905920 is about 15617.4876340595. The cubic root of 243905920 is about 624.7996541853.

The spelling of 243905920 in words is "two hundred forty-three million, nine hundred five thousand, nine hundred twenty".