243680938 has 8 divisors (see below), whose sum is σ = 365703300. Its totient is φ = 121779840.

The previous prime is 243680933. The next prime is 243680963. The reversal of 243680938 is 839086342.

It can be written as a sum of positive squares in 2 ways, for example, as 240343009 + 3337929 = 15503^2 + 1827^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 243680894 and 243680903.

It is not an unprimeable number, because it can be changed into a prime (243680933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25113 + ... + 33436.

Almost surely, 2^243680938 is an apocalyptic number.

243680938 is a deficient number, since it is larger than the sum of its proper divisors (122022362).

243680938 is a wasteful number, since it uses less digits than its factorization.

243680938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60632.

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 243680938 is about 15610.2830851974. The cubic root of 243680938 is about 624.6074873057.

The spelling of 243680938 in words is "two hundred forty-three million, six hundred eighty thousand, nine hundred thirty-eight".