42838 has 4 divisors (see below), whose sum is σ = 64260.
Its totient is φ = 21418.
The previous prime is 42829. The next prime is 42839. The reversal of 42838 is 83824.
It is a semiprime because it is the product of two primes.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (42839) by changing a digit.
42838 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10708 + ... + 10711.
It is an arithmetic number, because the mean of its divisors is an integer number (16065).
242838 is an apocalyptic number.
42838 is a deficient number, since it is larger than the sum of its proper divisors (21422).
42838 is a wasteful number, since it uses less digits than its factorization.
42838 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 21421.
The product of its digits is 1536, while the sum is 25.
The square root of 42838 is about 206.9734282462.
The cubic root of 42838 is about 34.9899290753.
The spelling of 42838 in words is "forty-two thousand, eight hundred thirty-eight".