7838865 has 12 divisors (see below), whose sum is σ = 13587444. Its totient is φ = 4180704.

The previous prime is 7838851. The next prime is 7838879. The reversal of 7838865 is 5688387.

It is an interprime number because it is at equal distance from previous prime (7838851) and next prime (7838879).

It can be written as a sum of positive squares in 2 ways, for example, as 3640464 + 4198401 = 1908^2 + 2049^2 .

It is not a de Polignac number, because 7838865 - 2⁷ = 7838737 is a prime.

It is a super-2 number, since 2×7838865² = 122895608976450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 174197 = 7838865 / (7 + 8 + 3 + 8 + 8 + 6 + 5).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7838865.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87054 + ... + 87143.

It is an arithmetic number, because the mean of its divisors is an integer number (1132287).

Almost surely, 2^7838865 is an apocalyptic number.

It is an amenable number.

7838865 is a deficient number, since it is larger than the sum of its proper divisors (5748579).

7838865 is a wasteful number, since it uses less digits than its factorization.

7838865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174208 (or 174205 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 7838865 is about 2799.7973140926. The cubic root of 7838865 is about 198.6480906288.

Subtracting from 7838865 its sum of digits (45), we obtain a triangular number (7838820 = T₃₉₅₉).

The spelling of 7838865 in words is "seven million, eight hundred thirty-eight thousand, eight hundred sixty-five".