7798865 has 4 divisors (see below), whose sum is σ = 9358644. Its totient is φ = 6239088.

The previous prime is 7798859. The next prime is 7798877. The reversal of 7798865 is 5688977.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5688977 = 7 ⋅812711.

It can be written as a sum of positive squares in 2 ways, for example, as 2383936 + 5414929 = 1544^2 + 2327^2 .

It is a cyclic number.

It is not a de Polignac number, because 7798865 - 2¹⁰ = 7797841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 779882 + ... + 779891.

It is an arithmetic number, because the mean of its divisors is an integer number (2339661).

Almost surely, 2^7798865 is an apocalyptic number.

It is an amenable number.

7798865 is a deficient number, since it is larger than the sum of its proper divisors (1559779).

7798865 is a wasteful number, since it uses less digits than its factorization.

7798865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1559778.

The product of its digits is 846720, while the sum is 50.

The square root of 7798865 is about 2792.6448037658. The cubic root of 7798865 is about 198.3096284704.

The spelling of 7798865 in words is "seven million, seven hundred ninety-eight thousand, eight hundred sixty-five".