71439 has 4 divisors (see below), whose sum is σ = 95256. Its totient is φ = 47624.

The previous prime is 71437. The next prime is 71443. The reversal of 71439 is 93417.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93417 = 3 ⋅31139.

It is a cyclic number.

It is not a de Polignac number, because 71439 - 2¹ = 71437 is a prime.

It is a D-number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 71439.

It is not an unprimeable number, because it can be changed into a prime (71437) 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, 11904 + ... + 11909.

It is an arithmetic number, because the mean of its divisors is an integer number (23814).

2⁷¹⁴³⁹ is an apocalyptic number.

71439 is a deficient number, since it is larger than the sum of its proper divisors (23817).

71439 is a wasteful number, since it uses less digits than its factorization.

71439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23816.

The product of its digits is 756, while the sum is 24.

The square root of 71439 is about 267.2807512710. The cubic root of 71439 is about 41.4933458146.

The spelling of 71439 in words is "seventy-one thousand, four hundred thirty-nine".