243313840 has 80 divisors (see below), whose sum is σ = 705312000. Its totient is φ = 75836160.

The previous prime is 243313793. The next prime is 243313879. The reversal of 243313840 is 48313342.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 243313799 and 243313808.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13590 + ... + 25909.

It is an arithmetic number, because the mean of its divisors is an integer number (8816400).

Almost surely, 2^243313840 is an apocalyptic number.

243313840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243313840 is an abundant number, since it is smaller than the sum of its proper divisors (461998160).

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

243313840 is a wasteful number, since it uses less digits than its factorization.

243313840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39530 (or 39524 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 243313840 is about 15598.5204426574. The cubic root of 243313840 is about 624.2936788774.

The spelling of 243313840 in words is "two hundred forty-three million, three hundred thirteen thousand, eight hundred forty".