842440 has 16 divisors (see below), whose sum is σ = 1895580. Its totient is φ = 336960.

The previous prime is 842423. The next prime is 842447. The reversal of 842440 is 44248.

842440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 777924 + 64516 = 882^2 + 254^2 .

It is not an unprimeable number, because it can be changed into a prime (842447) 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, 10491 + ... + 10570.

2⁸⁴²⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

842440 is an abundant number, since it is smaller than the sum of its proper divisors (1053140).

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

842440 is a wasteful number, since it uses less digits than its factorization.

842440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21072 (or 21068 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 842440 is about 917.8453028697. The cubic root of 842440 is about 94.4451498089.

Adding to 842440 its reverse (44248), we get a palindrome (886688).

It can be divided in two parts, 8424 and 40, that added together give a square (8464 = 92²).

The spelling of 842440 in words is "eight hundred forty-two thousand, four hundred forty".