7999609 has 4 divisors (see below), whose sum is σ = 8070516. Its totient is φ = 7928704.

The previous prime is 7999577. The next prime is 7999613. The reversal of 7999609 is 9069997.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9069997 = 2689 ⋅3373.

It can be written as a sum of positive squares in 2 ways, for example, as 176400 + 7823209 = 420^2 + 2797^2 .

It is a cyclic number.

It is not a de Polignac number, because 7999609 - 2⁵ = 7999577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7999669) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 35284 + ... + 35509.

It is an arithmetic number, because the mean of its divisors is an integer number (2017629).

Almost surely, 2^7999609 is an apocalyptic number.

It is an amenable number.

7999609 is a deficient number, since it is larger than the sum of its proper divisors (70907).

7999609 is a wasteful number, since it uses less digits than its factorization.

7999609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70906.

The product of its (nonzero) digits is 275562, while the sum is 49.

The square root of 7999609 is about 2828.3580042138. The cubic root of 7999609 is about 199.9967416136.

The spelling of 7999609 in words is "seven million, nine hundred ninety-nine thousand, six hundred nine".