442818 has 24 divisors (see below), whose sum is σ = 975468. Its totient is φ = 145152.

The previous prime is 442817. The next prime is 442823. The reversal of 442818 is 818244.

It can be written as a sum of positive squares in 2 ways, for example, as 439569 + 3249 = 663^2 + 57^2 .

It is a super-2 number, since 2×442818² = 392175562248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 442791 and 442800.

It is not an unprimeable number, because it can be changed into a prime (442817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1146 + ... + 1482.

2⁴⁴²⁸¹⁸ is an apocalyptic number.

442818 is an abundant number, since it is smaller than the sum of its proper divisors (532650).

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

442818 is a wasteful number, since it uses less digits than its factorization.

442818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418 (or 415 counting only the distinct ones).

The product of its digits is 2048, while the sum is 27.

The square root of 442818 is about 665.4457152916. The cubic root of 442818 is about 76.2210783443.

The spelling of 442818 in words is "four hundred forty-two thousand, eight hundred eighteen".