243121896 has 96 divisors (see below), whose sum is σ = 700539840. Its totient is φ = 75907584.

The previous prime is 243121861. The next prime is 243121903. The reversal of 243121896 is 698121342.

243121896 is a `hidden beast` number, since 2 + 431 + 218 + 9 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 243121896.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 375445 + ... + 376091.

It is an arithmetic number, because the mean of its divisors is an integer number (7297290).

Almost surely, 2^243121896 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243121896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (350269920).

243121896 is an abundant number, since it is smaller than the sum of its proper divisors (457417944).

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

243121896 is a wasteful number, since it uses less digits than its factorization.

243121896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983 (or 976 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 243121896 is about 15592.3665939459. The cubic root of 243121896 is about 624.1294726410.

The spelling of 243121896 in words is "two hundred forty-three million, one hundred twenty-one thousand, eight hundred ninety-six".