243887842 has 12 divisors (see below), whose sum is σ = 402112998. Its totient is φ = 110858000.

The previous prime is 243887807. The next prime is 243887843. The reversal of 243887842 is 248788342.

It can be written as a sum of positive squares in only one way, i.e., 177449041 + 66438801 = 13321^2 + 8151^2 .

It is a junction number, because it is equal to n+sod(n) for n = 243887792 and 243887801.

It is not an unprimeable number, because it can be changed into a prime (243887843) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 503659 + ... + 504142.

Almost surely, 2^243887842 is an apocalyptic number.

243887842 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

243887842 is a deficient number, since it is larger than the sum of its proper divisors (158225156).

243887842 is a wasteful number, since it uses less digits than its factorization.

243887842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007825 (or 1007814 counting only the distinct ones).

The product of its digits is 688128, while the sum is 46.

The square root of 243887842 is about 15616.9088490648. The cubic root of 243887842 is about 624.7842173491.

It can be divided in two parts, 24 and 3887842, that added together give a triangular number (3887866 = T₂₇₈₈).

The spelling of 243887842 in words is "two hundred forty-three million, eight hundred eighty-seven thousand, eight hundred forty-two".