442638 has 32 divisors (see below), whose sum is σ = 1125120. Its totient is φ = 126360.

The previous prime is 442633. The next prime is 442691. The reversal of 442638 is 836244.

442638 is nontrivially palindromic in base 13.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 208 + ... + 963.

It is an arithmetic number, because the mean of its divisors is an integer number (35160).

2⁴⁴²⁶³⁸ is an apocalyptic number.

442638 is an abundant number, since it is smaller than the sum of its proper divisors (682482).

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

442638 is a wasteful number, since it uses less digits than its factorization.

442638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189 (or 1183 counting only the distinct ones).

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

The square root of 442638 is about 665.3104538484. The cubic root of 442638 is about 76.2107493051.

The spelling of 442638 in words is "four hundred forty-two thousand, six hundred thirty-eight".