243117890 has 32 divisors (see below), whose sum is σ = 450560880. Its totient is φ = 94408704.

The previous prime is 243117883. The next prime is 243117893. The reversal of 243117890 is 98711342.

243117890 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 52374169 + 190743721 = 7237^2 + 13811^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 243117890.

It is not an unprimeable number, because it can be changed into a prime (243117893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49046 + ... + 53774.

Almost surely, 2^243117890 is an apocalyptic number.

243117890 is a deficient number, since it is larger than the sum of its proper divisors (207442990).

243117890 is a wasteful number, since it uses less digits than its factorization.

243117890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4886.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 243117890 is about 15592.2381331225. The cubic root of 243117890 is about 624.1260446262.

The spelling of 243117890 in words is "two hundred forty-three million, one hundred seventeen thousand, eight hundred ninety".