243909128 has 16 divisors (see below), whose sum is σ = 462469500. Its totient is φ = 120583936.

The previous prime is 243909121. The next prime is 243909131. The reversal of 243909128 is 821909342.

It can be written as a sum of positive squares in 2 ways, for example, as 243297604 + 611524 = 15598^2 + 782^2 .

It is a junction number, because it is equal to n+sod(n) for n = 243909091 and 243909100.

It is not an unprimeable number, because it can be changed into a prime (243909121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170573 + ... + 171996.

Almost surely, 2^243909128 is an apocalyptic number.

It is an amenable number.

243909128 is a deficient number, since it is larger than the sum of its proper divisors (218560372).

243909128 is a wasteful number, since it uses less digits than its factorization.

243909128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342664 (or 342660 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 243909128 is about 15617.5903391016. The cubic root of 243909128 is about 624.8023934225.

The spelling of 243909128 in words is "two hundred forty-three million, nine hundred nine thousand, one hundred twenty-eight".