7999685 has 4 divisors (see below), whose sum is σ = 9599628. Its totient is φ = 6399744.

The previous prime is 7999681. The next prime is 7999709. The reversal of 7999685 is 5869997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5869997 = 7 ⋅838571.

It can be written as a sum of positive squares in 2 ways, for example, as 4532641 + 3467044 = 2129^2 + 1862^2 .

It is a cyclic number.

It is not a de Polignac number, because 7999685 - 2² = 7999681 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7999681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 799964 + ... + 799973.

It is an arithmetic number, because the mean of its divisors is an integer number (2399907).

Almost surely, 2^7999685 is an apocalyptic number.

It is an amenable number.

7999685 is a deficient number, since it is larger than the sum of its proper divisors (1599943).

7999685 is a wasteful number, since it uses less digits than its factorization.

7999685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1599942.

The product of its digits is 1224720, while the sum is 53.

The square root of 7999685 is about 2828.3714395390. The cubic root of 7999685 is about 199.9973749655.

The spelling of 7999685 in words is "seven million, nine hundred ninety-nine thousand, six hundred eighty-five".