7988865 has 16 divisors (see below), whose sum is σ = 12993216. Its totient is φ = 4190400.

The previous prime is 7988857. The next prime is 7988899. The reversal of 7988865 is 5688897.

It is a happy number.

It is not a de Polignac number, because 7988865 - 2³ = 7988857 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3451 + ... + 5280.

It is an arithmetic number, because the mean of its divisors is an integer number (812076).

Almost surely, 2^7988865 is an apocalyptic number.

It is an amenable number.

7988865 is a deficient number, since it is larger than the sum of its proper divisors (5004351).

7988865 is a wasteful number, since it uses less digits than its factorization.

7988865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8800.

The product of its digits is 967680, while the sum is 51.

The square root of 7988865 is about 2826.4580308223. The cubic root of 7988865 is about 199.9071652485.

Subtracting from 7988865 its reverse (5688897), we obtain a cube (2299968 = 132³).

The spelling of 7988865 in words is "seven million, nine hundred eighty-eight thousand, eight hundred sixty-five".