842405331 has 4 divisors (see below), whose sum is σ = 1123207112. Its totient is φ = 561603552.

The previous prime is 842405321. The next prime is 842405339. The reversal of 842405331 is 133504248.

842405331 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.

It is not a de Polignac number, because 842405331 - 2²⁵ = 808850899 is a prime.

It is a super-2 number, since 2×842405331² = 1419293483394439122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (842405339) 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, 140400886 + ... + 140400891.

It is an arithmetic number, because the mean of its divisors is an integer number (280801778).

Almost surely, 2^842405331 is an apocalyptic number.

842405331 is a deficient number, since it is larger than the sum of its proper divisors (280801781).

842405331 is a wasteful number, since it uses less digits than its factorization.

842405331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280801780.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 842405331 is about 29024.2197311142. The cubic root of 842405331 is about 944.4385422156.

Adding to 842405331 its reverse (133504248), we get a palindrome (975909579).

The spelling of 842405331 in words is "eight hundred forty-two million, four hundred five thousand, three hundred thirty-one".