807999979 has 2 divisors, whose sum is σ = 807999980. Its totient is φ = 807999978.

The previous prime is 807999949. The next prime is 807999991. The reversal of 807999979 is 979999708.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 807999979 - 2²¹ = 805902827 is a prime.

It is not a weakly prime, because it can be changed into another prime (807999949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403999989 + 403999990.

It is an arithmetic number, because the mean of its divisors is an integer number (403999990).

Almost surely, 2^807999979 is an apocalyptic number.

807999979 is a deficient number, since it is larger than the sum of its proper divisors (1).

807999979 is an equidigital number, since it uses as much as digits as its factorization.

807999979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23147208, while the sum is 67.

The square root of 807999979 is about 28425.3404377151. The cubic root of 807999979 is about 931.4018934917.

The spelling of 807999979 in words is "eight hundred seven million, nine hundred ninety-nine thousand, nine hundred seventy-nine".