942840 has 96 divisors (see below), whose sum is σ = 3210480. Its totient is φ = 248832.

The previous prime is 942827. The next prime is 942847. The reversal of 942840 is 48249.

It is a Cunningham number, because it is equal to 971²-1.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 942840.

It is not an unprimeable number, because it can be changed into a prime (942847) by changing a digit.

942840 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9672 + ... + 9768.

2⁹⁴²⁸⁴⁰ is an apocalyptic number.

942840 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 942840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1605240).

942840 is an abundant number, since it is smaller than the sum of its proper divisors (2267640).

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

942840 is a wasteful number, since it uses less digits than its factorization.

942840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 942840 is about 970.9994850668. Note that the first 3 decimals coincide. The cubic root of 942840 is about 98.0571650378.

It can be divided in two parts, 9 and 42840, that added together give a square (42849 = 207²).

The spelling of 942840 in words is "nine hundred forty-two thousand, eight hundred forty".