7980909 has 4 divisors (see below), whose sum is σ = 10641216. Its totient is φ = 5320604.

The previous prime is 7980881. The next prime is 7980911. The reversal of 7980909 is 9090897.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 7980909 - 2¹⁷ = 7849837 is a prime.

7980909 is a modest number, since divided by 909 gives 798 as remainder.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7980409) 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, 1330149 + ... + 1330154.

It is an arithmetic number, because the mean of its divisors is an integer number (2660304).

Almost surely, 2^7980909 is an apocalyptic number.

It is an amenable number.

7980909 is a deficient number, since it is larger than the sum of its proper divisors (2660307).

7980909 is a wasteful number, since it uses less digits than its factorization.

7980909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2660306.

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 7980909 is about 2825.0502650395. The cubic root of 7980909 is about 199.8407816145.

The spelling of 7980909 in words is "seven million, nine hundred eighty thousand, nine hundred nine".