243788890 has 16 divisors (see below), whose sum is σ = 440444160. Its totient is φ = 97154640.

The previous prime is 243788863. The next prime is 243788899. The reversal of 243788890 is 98887342.

It is not an unprimeable number, because it can be changed into a prime (243788899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42270 + ... + 47689.

It is an arithmetic number, because the mean of its divisors is an integer number (27527760).

Almost surely, 2^243788890 is an apocalyptic number.

243788890 is a deficient number, since it is larger than the sum of its proper divisors (196655270).

243788890 is a wasteful number, since it uses less digits than its factorization.

243788890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90237.

The product of its (nonzero) digits is 774144, while the sum is 49.

The square root of 243788890 is about 15613.7404231017. The cubic root of 243788890 is about 624.6997085432.

The spelling of 243788890 in words is "two hundred forty-three million, seven hundred eighty-eight thousand, eight hundred ninety".