2720009 has 2 divisors, whose sum is σ = 2720010. Its totient is φ = 2720008.

The previous prime is 2719991. The next prime is 2720071. The reversal of 2720009 is 9000272.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2325625 + 394384 = 1525^2 + 628^2 .

It is a cyclic number.

It is not a de Polignac number, because 2720009 - 2⁸ = 2719753 is a prime.

It is a Chen prime.

It is equal to p₁₉₈₀₂₀ and since 2720009 and 198020 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (2720089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1360004 + 1360005.

It is an arithmetic number, because the mean of its divisors is an integer number (1360005).

2^2720009 is an apocalyptic number.

It is an amenable number.

2720009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2720009 is an equidigital number, since it uses as much as digits as its factorization.

2720009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 2720009 is about 1649.2449787706. The cubic root of 2720009 is about 139.5907948983.

The spelling of 2720009 in words is "two million, seven hundred twenty thousand, nine".