39871 has 4 divisors (see below), whose sum is σ = 42952. Its totient is φ = 36792.

The previous prime is 39869. The next prime is 39877. The reversal of 39871 is 17893.

39871 = 79² + 80² + ... + 84².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17893 = 29 ⋅617.

It is a cyclic number.

It is not a de Polignac number, because 39871 - 2¹ = 39869 is a prime.

It is a plaindrome in base 8 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39877) 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, 1521 + ... + 1546.

It is an arithmetic number, because the mean of its divisors is an integer number (10738).

2³⁹⁸⁷¹ is an apocalyptic number.

39871 is a deficient number, since it is larger than the sum of its proper divisors (3081).

39871 is a wasteful number, since it uses less digits than its factorization.

39871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3080.

The product of its digits is 1512, while the sum is 28.

The square root of 39871 is about 199.6772395643. The cubic root of 39871 is about 34.1627148579.

The spelling of 39871 in words is "thirty-nine thousand, eight hundred seventy-one".