243640384 has 28 divisors (see below), whose sum is σ = 520665964. Its totient is φ = 112449024.

The previous prime is 243640367. The next prime is 243640399. The reversal of 243640384 is 483046342.

It can be written as a sum of positive squares in 2 ways, for example, as 118200384 + 125440000 = 10872^2 + 11200^2 .

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, 145587 + ... + 147250.

It is an arithmetic number, because the mean of its divisors is an integer number (18595213).

Almost surely, 2^243640384 is an apocalyptic number.

It is an amenable number.

243640384 is an abundant number, since it is smaller than the sum of its proper divisors (277025580).

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

243640384 is a wasteful number, since it uses less digits than its factorization.

243640384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292862 (or 292852 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 34.

The square root of 243640384 is about 15608.9840796895. The cubic root of 243640384 is about 624.5728357957.

The spelling of 243640384 in words is "two hundred forty-three million, six hundred forty thousand, three hundred eighty-four".