71239 has 4 divisors (see below), whose sum is σ = 81424. Its totient is φ = 61056.

The previous prime is 71237. The next prime is 71249. The reversal of 71239 is 93217.

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

It is a cyclic number.

It is not a de Polignac number, because 71239 - 2¹ = 71237 is a prime.

71239 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71233) 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, 5082 + ... + 5095.

It is an arithmetic number, because the mean of its divisors is an integer number (20356).

2⁷¹²³⁹ is an apocalyptic number.

71239 is a deficient number, since it is larger than the sum of its proper divisors (10185).

71239 is a wasteful number, since it uses less digits than its factorization.

71239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10184.

The product of its digits is 378, while the sum is 22.

The square root of 71239 is about 266.9063506176. The cubic root of 71239 is about 41.4545881541.

Subtracting from 71239 its sum of digits (22), we obtain a palindrome (71217).

Adding to 71239 its product of digits (378), we get a palindrome (71617).

The spelling of 71239 in words is "seventy-one thousand, two hundred thirty-nine".