799999999 has 2 divisors, whose sum is σ = 800000000. Its totient is φ = 799999998.

The previous prime is 799999987. The next prime is 800000011. The reversal of 799999999 is 999999997.

It is a balanced prime because it is at equal distance from previous prime (799999987) and next prime (800000011).

It is a cyclic number.

It is not a de Polignac number, because 799999999 - 2²⁵ = 766445567 is a prime.

799999999 is a modest number, since divided by 99999 gives 7999 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (799999969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 399999999 + 400000000.

It is an arithmetic number, because the mean of its divisors is an integer number (400000000).

Almost surely, 2^799999999 is an apocalyptic number.

799999999 is a deficient number, since it is larger than the sum of its proper divisors (1).

799999999 is an equidigital number, since it uses as much as digits as its factorization.

799999999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 301327047, while the sum is 79.

The square root of 799999999 is about 28284.2712297842. The cubic root of 799999999 is about 928.3177663358.

It can be divided in two parts, 79999999 and 9, that added together give a palindrome (80000008).

The spelling of 799999999 in words is "seven hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".