71979 has 4 divisors (see below), whose sum is σ = 95976. Its totient is φ = 47984.

The previous prime is 71971. The next prime is 71983. The reversal of 71979 is 97917.

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 71979 - 2³ = 71971 is a prime.

It is a D-number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (71971) 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, 11994 + ... + 11999.

It is an arithmetic number, because the mean of its divisors is an integer number (23994).

2⁷¹⁹⁷⁹ is an apocalyptic number.

71979 is a deficient number, since it is larger than the sum of its proper divisors (23997).

71979 is a wasteful number, since it uses less digits than its factorization.

71979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23996.

The product of its digits is 3969, while the sum is 33.

The square root of 71979 is about 268.2890232566. The cubic root of 71979 is about 41.5976314603.

The spelling of 71979 in words is "seventy-one thousand, nine hundred seventy-nine".