79939 has 2 divisors, whose sum is σ = 79940. Its totient is φ = 79938.

The previous prime is 79907. The next prime is 79943. The reversal of 79939 is 93997.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (93997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79939 - 2⁵ = 79907 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 79898 and 79907.

It is not a weakly prime, because it can be changed into another prime (79979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39969 + 39970.

It is an arithmetic number, because the mean of its divisors is an integer number (39970).

2⁷⁹⁹³⁹ is an apocalyptic number.

79939 is a deficient number, since it is larger than the sum of its proper divisors (1).

79939 is an equidigital number, since it uses as much as digits as its factorization.

79939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15309, while the sum is 37.

The square root of 79939 is about 282.7348581268. The cubic root of 79939 is about 43.0777393062.

It can be divided in two parts, 799 and 39, that added together give a palindrome (838).

The spelling of 79939 in words is "seventy-nine thousand, nine hundred thirty-nine".