4243721808 has 40 divisors (see below), whose sum is σ = 11259248608. Its totient is φ = 1376341632.

The previous prime is 4243721737. The next prime is 4243721831. The reversal of 4243721808 is 8081273424.

4243721808 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 1192966 + ... + 1196517.

Almost surely, 2^4243721808 is an apocalyptic number.

4243721808 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

4243721808 is an abundant number, since it is smaller than the sum of its proper divisors (7015526800).

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

4243721808 is a wasteful number, since it uses less digits than its factorization.

4243721808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2389531 (or 2389525 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 39.

The square root of 4243721808 is about 65143.8547216850. The cubic root of 4243721808 is about 1619.0079034566.

The spelling of 4243721808 in words is "four billion, two hundred forty-three million, seven hundred twenty-one thousand, eight hundred eight".