79996999 has 2 divisors, whose sum is σ = 79997000.
Its totient is φ = 79996998.
The previous prime is 79996991. The next prime is 79997003. The reversal of 79996999 is 99969997.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 79996999 - 23 = 79996991 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (79996991) 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 as a sum of consecutive naturals, namely, 39998499 + 39998500.
It is an arithmetic number, because the mean of its divisors is an integer number (39998500).
Almost surely, 279996999 is an apocalyptic number.
79996999 is a deficient number, since it is larger than the sum of its proper divisors (1).
79996999 is an equidigital number, since it uses as much as digits as its factorization.
79996999 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 22320522, while the sum is 67.
The square root of 79996999 is about 8944.1041474258.
The cubic root of 79996999 is about 430.8815500569.
The spelling of 79996999 in words is "seventy-nine million, nine hundred ninety-six thousand, nine hundred ninety-nine".