999979 has 2 divisors, whose sum is σ = 999980.
Its totient is φ = 999978.
The previous prime is 999961. The next prime is 999983. The reversal of 999979 is 979999.
It can be divided in two parts, 9 and 99979, that multiplied together give a triangular number (899811 = T1341).
999979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 999979 - 219 = 475691 is a prime.
It is not a weakly prime, because it can be changed into another prime (999959) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499989 + 499990.
It is an arithmetic number, because the mean of its divisors is an integer number (499990).
2999979 is an apocalyptic number.
999979 is a deficient number, since it is larger than the sum of its proper divisors (1).
999979 is an equidigital number, since it uses as much as digits as its factorization.
999979 is an evil number, because the sum of its binary digits is even.
The product of its digits is 413343, while the sum is 52.
The square root of 999979 is about 999.9894999449.
The cubic root of 999979 is about 99.9992999951.
Note that the first 3 decimals are identical.
The spelling of 999979 in words is "nine hundred ninety-nine thousand, nine hundred seventy-nine".