71869 has 4 divisors (see below), whose sum is σ = 82144. Its totient is φ = 61596.

The previous prime is 71867. The next prime is 71879. The reversal of 71869 is 96817.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96817 = 7 ⋅13831.

It is a cyclic number.

It is not a de Polignac number, because 71869 - 2¹ = 71867 is a prime.

It is a super-2 number, since 2×71869² = 10330306322, which contains 22 as substring.

It is a Duffinian number.

71869 is a lucky number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 71869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71861) 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, 5127 + ... + 5140.

It is an arithmetic number, because the mean of its divisors is an integer number (20536).

2⁷¹⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

71869 is a deficient number, since it is larger than the sum of its proper divisors (10275).

71869 is a wasteful number, since it uses less digits than its factorization.

71869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10274.

The product of its digits is 3024, while the sum is 31.

The square root of 71869 is about 268.0839420778. The cubic root of 71869 is about 41.5764304973.

It can be divided in two parts, 718 and 69, that added together give a palindrome (787).

The spelling of 71869 in words is "seventy-one thousand, eight hundred sixty-nine".