842721839 has 8 divisors (see below), whose sum is σ = 902112000. Its totient is φ = 784835352.

The previous prime is 842721829. The next prime is 842721853. The reversal of 842721839 is 938127248.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-842721839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 842721839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842721829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 374759 + ... + 377000.

It is an arithmetic number, because the mean of its divisors is an integer number (112764000).

Almost surely, 2^842721839 is an apocalyptic number.

842721839 is a deficient number, since it is larger than the sum of its proper divisors (59390161).

842721839 is a wasteful number, since it uses less digits than its factorization.

842721839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751837.

The product of its digits is 193536, while the sum is 44.

The square root of 842721839 is about 29029.6716998315. The cubic root of 842721839 is about 944.5568086898.

The spelling of 842721839 in words is "eight hundred forty-two million, seven hundred twenty-one thousand, eight hundred thirty-nine".