799903865 has 4 divisors (see below), whose sum is σ = 959884644. Its totient is φ = 639923088.

The previous prime is 799903843. The next prime is 799903879. The reversal of 799903865 is 568309997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 568309997 = 2131 ⋅266687.

It can be written as a sum of positive squares in 2 ways, for example, as 576192016 + 223711849 = 24004^2 + 14957^2 .

It is a cyclic number.

It is not a de Polignac number, because 799903865 - 2¹² = 799899769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 799903865.

It is an unprimeable number.

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, 79990382 + ... + 79990391.

It is an arithmetic number, because the mean of its divisors is an integer number (239971161).

Almost surely, 2^799903865 is an apocalyptic number.

It is an amenable number.

799903865 is a deficient number, since it is larger than the sum of its proper divisors (159980779).

799903865 is a wasteful number, since it uses less digits than its factorization.

799903865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159980778.

The product of its (nonzero) digits is 3674160, while the sum is 56.

The square root of 799903865 is about 28282.5717536436. The cubic root of 799903865 is about 928.2805803044.

The spelling of 799903865 in words is "seven hundred ninety-nine million, nine hundred three thousand, eight hundred sixty-five".