7980009 has 4 divisors (see below), whose sum is σ = 10640016. Its totient is φ = 5320004.

The previous prime is 7979969. The next prime is 7980013. The reversal of 7980009 is 9000897.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9000897 = 3 ⋅3000299.

It is a cyclic number.

It is not a de Polignac number, because 7980009 - 2⁹ = 7979497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7980029) 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, 1329999 + ... + 1330004.

It is an arithmetic number, because the mean of its divisors is an integer number (2660004).

Almost surely, 2^7980009 is an apocalyptic number.

It is an amenable number.

7980009 is a deficient number, since it is larger than the sum of its proper divisors (2660007).

7980009 is a wasteful number, since it uses less digits than its factorization.

7980009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2660006.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 7980009 is about 2824.8909713474. The cubic root of 7980009 is about 199.8332693765.

The spelling of 7980009 in words is "seven million, nine hundred eighty thousand, nine".