442989 has 12 divisors (see below), whose sum is σ = 663936. Its totient is φ = 295164.

The previous prime is 442987. The next prime is 442991. The reversal of 442989 is 989244.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (442987) and next prime (442991).

It is not a de Polignac number, because 442989 - 2¹ = 442987 is a prime.

442989 is a lucky number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442987) 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, 669 + ... + 1154.

It is an arithmetic number, because the mean of its divisors is an integer number (55328).

2⁴⁴²⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

442989 is a deficient number, since it is larger than the sum of its proper divisors (220947).

442989 is an equidigital number, since it uses as much as digits as its factorization.

442989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838 (or 1826 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 442989 is about 665.5741882014. The cubic root of 442989 is about 76.2308883393.

It can be divided in two parts, 442 and 989, that added together give a triangular number (1431 = T₅₃).

The spelling of 442989 in words is "four hundred forty-two thousand, nine hundred eighty-nine".