243091938 has 8 divisors (see below), whose sum is σ = 486183888. Its totient is φ = 81030644.

The previous prime is 243091921. The next prime is 243091939. The reversal of 243091938 is 839190342.

It is a sphenic number, since it is the product of 3 distinct primes.

243091938 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 243091896 and 243091905.

It is not an unprimeable number, because it can be changed into a prime (243091939) 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, 20257656 + ... + 20257667.

It is an arithmetic number, because the mean of its divisors is an integer number (60772986).

Almost surely, 2^243091938 is an apocalyptic number.

243091938 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

243091938 is a wasteful number, since it uses less digits than its factorization.

243091938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40515328.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 243091938 is about 15591.4059019705. The cubic root of 243091938 is about 624.1038360651.

The spelling of 243091938 in words is "two hundred forty-three million, ninety-one thousand, nine hundred thirty-eight".