442864 has 20 divisors (see below), whose sum is σ = 870480. Its totient is φ = 218240.

The previous prime is 442861. The next prime is 442879. The reversal of 442864 is 468244.

It is a super-2 number, since 2×442864² = 392257044992, which contains 22 as substring.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442861) 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, 1269 + ... + 1579.

It is an arithmetic number, because the mean of its divisors is an integer number (43524).

2⁴⁴²⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

442864 is a deficient number, since it is larger than the sum of its proper divisors (427616).

442864 is a wasteful number, since it uses less digits than its factorization.

442864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408 (or 402 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

The square root of 442864 is about 665.4802776942. The cubic root of 442864 is about 76.2237175386.

The spelling of 442864 in words is "four hundred forty-two thousand, eight hundred sixty-four".