71405 has 4 divisors (see below), whose sum is σ = 85692. Its totient is φ = 57120.

The previous prime is 71399. The next prime is 71411. The reversal of 71405 is 50417.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (71399) and next prime (71411).

It can be written as a sum of positive squares in 2 ways, for example, as 7396 + 64009 = 86^2 + 253^2 .

It is not a de Polignac number, because 71405 - 2⁴ = 71389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 13.

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 71405.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7136 + ... + 7145.

It is an arithmetic number, because the mean of its divisors is an integer number (21423).

2⁷¹⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

71405 is a deficient number, since it is larger than the sum of its proper divisors (14287).

71405 is a wasteful number, since it uses less digits than its factorization.

71405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14286.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 71405 is about 267.2171401688. The cubic root of 71405 is about 41.4867621202.

The spelling of 71405 in words is "seventy-one thousand, four hundred five".