43139 has 4 divisors (see below), whose sum is σ = 43560. Its totient is φ = 42720.

The previous prime is 43133. The next prime is 43151. The reversal of 43139 is 93134.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 93134 = 2 ⋅46567.

It is a cyclic number.

It is not a de Polignac number, because 43139 - 2¹² = 39043 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 43139.

It is not an unprimeable number, because it can be changed into a prime (43133) 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, 59 + ... + 299.

It is an arithmetic number, because the mean of its divisors is an integer number (10890).

2⁴³¹³⁹ is an apocalyptic number.

43139 is a deficient number, since it is larger than the sum of its proper divisors (421).

43139 is a wasteful number, since it uses less digits than its factorization.

43139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420.

The product of its digits is 324, while the sum is 20.

The square root of 43139 is about 207.6993018765. The cubic root of 43139 is about 35.0716897937.

The spelling of 43139 in words is "forty-three thousand, one hundred thirty-nine".