842382721 has 4 divisors (see below), whose sum is σ = 846616000. Its totient is φ = 838149444.

The previous prime is 842382701. The next prime is 842382769. The reversal of 842382721 is 127283248.

842382721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 842382721 - 2⁹ = 842382209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (842382701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2116341 + ... + 2116738.

It is an arithmetic number, because the mean of its divisors is an integer number (211654000).

Almost surely, 2^842382721 is an apocalyptic number.

It is an amenable number.

842382721 is a deficient number, since it is larger than the sum of its proper divisors (4233279).

842382721 is a wasteful number, since it uses less digits than its factorization.

842382721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4233278.

The product of its digits is 43008, while the sum is 37.

The square root of 842382721 is about 29023.8302262124. The cubic root of 842382721 is about 944.4300926226.

The spelling of 842382721 in words is "eight hundred forty-two million, three hundred eighty-two thousand, seven hundred twenty-one".