789999999 has 16 divisors (see below), whose sum is σ = 1078704000. Its totient is φ = 514001376.

The previous prime is 789999989. The next prime is 790000019. The reversal of 789999999 is 999999987.

It is a happy number.

It is not a de Polignac number, because 789999999 - 2⁴ = 789999983 is a prime.

789999999 is a modest number, since divided by 99999 gives 7899 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (789999919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291352 + ... + 294050.

It is an arithmetic number, because the mean of its divisors is an integer number (67419000).

Almost surely, 2^789999999 is an apocalyptic number.

789999999 is a deficient number, since it is larger than the sum of its proper divisors (288704001).

789999999 is a wasteful number, since it uses less digits than its factorization.

789999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5014.

The product of its digits is 267846264, while the sum is 78.

The square root of 789999999 is about 28106.9386273212. The cubic root of 789999999 is about 924.4335461476.

The spelling of 789999999 in words is "seven hundred eighty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".