43138 has 4 divisors (see below), whose sum is σ = 64710. Its totient is φ = 21568.
The previous prime is 43133. The next prime is 43151. The reversal of 43138 is 83134.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in only one way, i.e., 42849 + 289 = 207^2 + 17^2 .
It is an Ulam number.
It is a nialpdrome in base 16.
It is not an unprimeable number, because it can be changed into a prime (43133) by changing a digit.
43138 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a pernicious number, because its binary representation contains a prime number (5) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10783 + ... + 10786.
243138 is an apocalyptic number.
43138 is a deficient number, since it is larger than the sum of its proper divisors (21572).
43138 is a wasteful number, since it uses less digits than its factorization.
43138 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 21571.
The product of its digits is 288, while the sum is 19.
The square root of 43138 is about 207.6968945362. The cubic root of 43138 is about 35.0714187940.
It can be divided in two parts, 43 and 138, that added together give a palindrome (181).
The spelling of 43138 in words is "forty-three thousand, one hundred thirty-eight".
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