79947 has 24 divisors (see below), whose sum is σ = 139776. Its totient is φ = 44712.

The previous prime is 79943. The next prime is 79967. The reversal of 79947 is 74997.

It is not a de Polignac number, because 79947 - 2² = 79943 is a prime.

It is a super-3 number, since 3×79947³ = 1532949222033369, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79943) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1678 + ... + 1724.

It is an arithmetic number, because the mean of its divisors is an integer number (5824).

2⁷⁹⁹⁴⁷ is an apocalyptic number.

79947 is a deficient number, since it is larger than the sum of its proper divisors (59829).

79947 is an equidigital number, since it uses as much as digits as its factorization.

79947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69 (or 57 counting only the distinct ones).

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

The square root of 79947 is about 282.7490053033. The cubic root of 79947 is about 43.0791762787.

Subtracting from 79947 its reverse (74997), we obtain a triangular number (4950 = T₉₉).

It can be divided in two parts, 7994 and 7, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 79947 in words is "seventy-nine thousand, nine hundred forty-seven".