798639997 has 4 divisors (see below), whose sum is σ = 799191100. Its totient is φ = 798088896.

The previous prime is 798639979. The next prime is 798640001. The reversal of 798639997 is 799936897.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 418038916 + 380601081 = 20446^2 + 19509^2 .

It is a cyclic number.

It is not a de Polignac number, because 798639997 - 2⁷ = 798639869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (798639917) 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 3 ways as a sum of consecutive naturals, for example, 273372 + ... + 276277.

It is an arithmetic number, because the mean of its divisors is an integer number (199797775).

Almost surely, 2^798639997 is an apocalyptic number.

It is an amenable number.

798639997 is a deficient number, since it is larger than the sum of its proper divisors (551103).

798639997 is a wasteful number, since it uses less digits than its factorization.

798639997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551102.

The product of its digits is 46294416, while the sum is 67.

The square root of 798639997 is about 28260.2193374361. The cubic root of 798639997 is about 927.7914204514.

The spelling of 798639997 in words is "seven hundred ninety-eight million, six hundred thirty-nine thousand, nine hundred ninety-seven".