842040 has 48 divisors (see below), whose sum is σ = 2737800. Its totient is φ = 224448.

The previous prime is 842021. The next prime is 842041. The reversal of 842040 is 40248.

It is a happy number.

842040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842041) by changing a digit.

842040 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 810 + ... + 1529.

2⁸⁴²⁰⁴⁰ is an apocalyptic number.

It is an amenable number.

842040 is an abundant number, since it is smaller than the sum of its proper divisors (1895760).

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

842040 is a wasteful number, since it uses less digits than its factorization.

842040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356 (or 2349 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 842040 is about 917.6273753545. The cubic root of 842040 is about 94.4301995689.

Adding to 842040 its reverse (40248), we get a palindrome (882288).

The spelling of 842040 in words is "eight hundred forty-two thousand, forty".