7280809 has 2 divisors, whose sum is σ = 7280810. Its totient is φ = 7280808.

The previous prime is 7280807. The next prime is 7280831. The reversal of 7280809 is 9080827.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7075600 + 205209 = 2660^2 + 453^2 .

It is a cyclic number.

It is not a de Polignac number, because 7280809 - 2¹ = 7280807 is a prime.

Together with 7280807, it forms a pair of twin primes.

7280809 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7280807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3640404 + 3640405.

It is an arithmetic number, because the mean of its divisors is an integer number (3640405).

Almost surely, 2^7280809 is an apocalyptic number.

It is an amenable number.

7280809 is a deficient number, since it is larger than the sum of its proper divisors (1).

7280809 is an equidigital number, since it uses as much as digits as its factorization.

7280809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 7280809 is about 2698.2974261560. The cubic root of 7280809 is about 193.8176005525.

The spelling of 7280809 in words is "seven million, two hundred eighty thousand, eight hundred nine".