79847 has 2 divisors, whose sum is σ = 79848. Its totient is φ = 79846.

The previous prime is 79843. The next prime is 79861. The reversal of 79847 is 74897.

It is a weak prime.

It is an emirp because it is prime and its reverse (74897) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79847 - 2² = 79843 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39923 + 39924.

It is an arithmetic number, because the mean of its divisors is an integer number (39924).

2⁷⁹⁸⁴⁷ is an apocalyptic number.

79847 is a deficient number, since it is larger than the sum of its proper divisors (1).

79847 is an equidigital number, since it uses as much as digits as its factorization.

79847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 35.

The square root of 79847 is about 282.5721146893. The cubic root of 79847 is about 43.0612072282.

Subtracting from 79847 its reverse (74897), we obtain a triangular number (4950 = T₉₉).

The spelling of 79847 in words is "seventy-nine thousand, eight hundred forty-seven".