799157987 has 4 divisors (see below), whose sum is σ = 804450576. Its totient is φ = 793865400.

The previous prime is 799157971. The next prime is 799158001. The reversal of 799157987 is 789751997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789751997 = 199 ⋅3968603.

It is a cyclic number.

It is not a de Polignac number, because 799157987 - 2⁴ = 799157971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (799157927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2646068 + ... + 2646369.

It is an arithmetic number, because the mean of its divisors is an integer number (201112644).

Almost surely, 2^799157987 is an apocalyptic number.

799157987 is a deficient number, since it is larger than the sum of its proper divisors (5292589).

799157987 is a wasteful number, since it uses less digits than its factorization.

799157987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5292588.

The product of its digits is 10001880, while the sum is 62.

The square root of 799157987 is about 28269.3825012150. The cubic root of 799157987 is about 927.9919625462.

The spelling of 799157987 in words is "seven hundred ninety-nine million, one hundred fifty-seven thousand, nine hundred eighty-seven".