7999985 has 12 divisors (see below), whose sum is σ = 11167668. Its totient is φ = 5485536.

The previous prime is 7999963. The next prime is 7999993. The reversal of 7999985 is 5899997.

It can be written as a sum of positive squares in 2 ways, for example, as 3013696 + 4986289 = 1736^2 + 2233^2 .

It is not a de Polignac number, because 7999985 - 2⁶ = 7999921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7999985.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16082 + ... + 16571.

It is an arithmetic number, because the mean of its divisors is an integer number (930639).

Almost surely, 2^7999985 is an apocalyptic number.

It is an amenable number.

7999985 is a deficient number, since it is larger than the sum of its proper divisors (3167683).

7999985 is a wasteful number, since it uses less digits than its factorization.

7999985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32672 (or 32665 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 56.

The square root of 7999985 is about 2828.4244730945. The cubic root of 7999985 is about 199.9998749999. Note that the first 3 decimals are identical.

It can be divided in two parts, 799 and 9985, that multiplied together give a triangular number (7978015 = T₃₉₉₄).

The spelling of 7999985 in words is "seven million, nine hundred ninety-nine thousand, nine hundred eighty-five".