442836 has 18 divisors (see below), whose sum is σ = 1119482. Its totient is φ = 147600.

The previous prime is 442831. The next prime is 442837. The reversal of 442836 is 638244.

It can be written as a sum of positive squares in only one way, i.e., 352836 + 90000 = 594^2 + 300^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×442836² = 392207445792, which contains 22 as substring.

It is a nialpdrome in base 9 and base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442831) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6115 + ... + 6186.

2⁴⁴²⁸³⁶ is an apocalyptic number.

It is an amenable number.

442836 is an abundant number, since it is smaller than the sum of its proper divisors (676646).

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

442836 is a wasteful number, since it uses less digits than its factorization.

442836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12311 (or 12306 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 442836 is about 665.4592399238. The cubic root of 442836 is about 76.2221110943. Note that the first 3 decimals are identical.

The spelling of 442836 in words is "four hundred forty-two thousand, eight hundred thirty-six".