442840 has 16 divisors (see below), whose sum is σ = 996480. Its totient is φ = 177120.

The previous prime is 442837. The next prime is 442843. The reversal of 442840 is 48244.

It is an interprime number because it is at equal distance from previous prime (442837) and next prime (442843).

It is a super-2 number, since 2×442840² = 392214531200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442843) 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, 5496 + ... + 5575.

It is an arithmetic number, because the mean of its divisors is an integer number (62280).

2⁴⁴²⁸⁴⁰ is an apocalyptic number.

442840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

442840 is an abundant number, since it is smaller than the sum of its proper divisors (553640).

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

442840 is a wasteful number, since it uses less digits than its factorization.

442840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11082 (or 11078 counting only the distinct ones).

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

The square root of 442840 is about 665.4622453603. The cubic root of 442840 is about 76.2223405905. Note that the first 3 decimals are identical.

The spelling of 442840 in words is "four hundred forty-two thousand, eight hundred forty".