7900865 has 24 divisors (see below), whose sum is σ = 11511360. Its totient is φ = 5085504.

The previous prime is 7900859. The next prime is 7900873. The reversal of 7900865 is 5680097.

It is not a de Polignac number, because 7900865 - 2⁸ = 7900609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72431 + ... + 72539.

It is an arithmetic number, because the mean of its divisors is an integer number (479640).

Almost surely, 2^7900865 is an apocalyptic number.

It is an amenable number.

7900865 is a deficient number, since it is larger than the sum of its proper divisors (3610495).

7900865 is a wasteful number, since it uses less digits than its factorization.

7900865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 7900865 is about 2810.8477368936. The cubic root of 7900865 is about 199.1704388992.

The spelling of 7900865 in words is "seven million, nine hundred thousand, eight hundred sixty-five".