42638 has 4 divisors (see below), whose sum is σ = 63960. Its totient is φ = 21318.

The previous prime is 42611. The next prime is 42641. The reversal of 42638 is 83624.

It is a happy number.

42638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10658 + ... + 10661.

It is an arithmetic number, because the mean of its divisors is an integer number (15990).

2⁴²⁶³⁸ is an apocalyptic number.

42638 is a deficient number, since it is larger than the sum of its proper divisors (21322).

42638 is a wasteful number, since it uses less digits than its factorization.

42638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21321.

The product of its digits is 1152, while the sum is 23.

The square root of 42638 is about 206.4897091867. The cubic root of 42638 is about 34.9353910111.

It can be divided in two parts, 426 and 38, that added together give a palindrome (464).

The spelling of 42638 in words is "forty-two thousand, six hundred thirty-eight".