243919940 has 24 divisors (see below), whose sum is σ = 558798912. Its totient is φ = 88698080.

The previous prime is 243919933. The next prime is 243919969. The reversal of 243919940 is 49919342.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 554144 + ... + 554583.

It is an arithmetic number, because the mean of its divisors is an integer number (23283288).

Almost surely, 2^243919940 is an apocalyptic number.

243919940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243919940 is an abundant number, since it is smaller than the sum of its proper divisors (314878972).

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

243919940 is a wasteful number, since it uses less digits than its factorization.

243919940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108747 (or 1108745 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 243919940 is about 15617.9364834155. The cubic root of 243919940 is about 624.8116253630.

The spelling of 243919940 in words is "two hundred forty-three million, nine hundred nineteen thousand, nine hundred forty".