842431 has 4 divisors (see below), whose sum is σ = 844272. Its totient is φ = 840592.

The previous prime is 842423. The next prime is 842447. The reversal of 842431 is 134248.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 842431 - 2³ = 842423 is a prime.

It is a super-2 number, since 2×842431² = 1419379979522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842531) 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, 366 + ... + 1348.

It is an arithmetic number, because the mean of its divisors is an integer number (211068).

2⁸⁴²⁴³¹ is an apocalyptic number.

842431 is a deficient number, since it is larger than the sum of its proper divisors (1841).

842431 is an equidigital number, since it uses as much as digits as its factorization.

842431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840.

The product of its digits is 768, while the sum is 22.

The square root of 842431 is about 917.8404000696. The cubic root of 842431 is about 94.4448134806. Note that the first 3 decimals are identical.

Adding to 842431 its reverse (134248), we get a palindrome (976679).

The spelling of 842431 in words is "eight hundred forty-two thousand, four hundred thirty-one".