47979 has 8 divisors (see below), whose sum is σ = 71120. Its totient is φ = 31968.

The previous prime is 47977. The next prime is 47981. The reversal of 47979 is 97974.

It is an interprime number because it is at equal distance from previous prime (47977) and next prime (47981).

It is not a de Polignac number, because 47979 - 2¹ = 47977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 862 + ... + 915.

It is an arithmetic number, because the mean of its divisors is an integer number (8890).

2⁴⁷⁹⁷⁹ is an apocalyptic number.

47979 is a deficient number, since it is larger than the sum of its proper divisors (23141).

47979 is a wasteful number, since it uses less digits than its factorization.

47979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786 (or 1780 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 47979 is about 219.0410920353. The cubic root of 47979 is about 36.3371111485.

The spelling of 47979 in words is "forty-seven thousand, nine hundred seventy-nine".