243943940 has 24 divisors (see below), whose sum is σ = 529948440. Its totient is φ = 94212608.

The previous prime is 243943919. The next prime is 243943979. The reversal of 243943940 is 49349342.

It can be written as a sum of positive squares in 4 ways, for example, as 11930116 + 232013824 = 3454^2 + 15232^2 .

It is a junction number, because it is equal to n+sod(n) for n = 243943894 and 243943903.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209717 + ... + 210876.

It is an arithmetic number, because the mean of its divisors is an integer number (22081185).

Almost surely, 2^243943940 is an apocalyptic number.

243943940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243943940 is an abundant number, since it is smaller than the sum of its proper divisors (286004500).

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

243943940 is a wasteful number, since it uses less digits than its factorization.

243943940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420631 (or 420629 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 243943940 is about 15618.7048118594. The cubic root of 243943940 is about 624.8321170419.

The spelling of 243943940 in words is "two hundred forty-three million, nine hundred forty-three thousand, nine hundred forty".