79979 has 2 divisors, whose sum is σ = 79980. Its totient is φ = 79978.
The previous prime is 79973. The next prime is 79987. The reversal of 79979 is 97997.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 79979 - 212 = 75883 is a prime.
It is not a weakly prime, because it can be changed into another prime (79973) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39989 + 39990.
It is an arithmetic number, because the mean of its divisors is an integer number (39990).
279979 is an apocalyptic number.
79979 is a deficient number, since it is larger than the sum of its proper divisors (1).
79979 is an equidigital number, since it uses as much as digits as its factorization.
79979 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 35721, while the sum is 41.
The square root of 79979 is about 282.8055869321. The cubic root of 79979 is about 43.0849232100.
It can be divided in two parts, 799 and 79, that added together give a palindrome (878).
The spelling of 79979 in words is "seventy-nine thousand, nine hundred seventy-nine".
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