2684809 has 2 divisors, whose sum is σ = 2684810. Its totient is φ = 2684808.

The previous prime is 2684807. The next prime is 2684819. The reversal of 2684809 is 9084862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2393209 + 291600 = 1547^2 + 540^2 .

It is a cyclic number.

It is not a de Polignac number, because 2684809 - 2¹ = 2684807 is a prime.

Together with 2684807, it forms a pair of twin primes.

It is a d-powerful number, because it can be written as 2¹⁹ + 6³ + 8 + 4⁶ + 8⁷ + 0 + 9⁵ .

It is not a weakly prime, because it can be changed into another prime (2684807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1342404 + 1342405.

It is an arithmetic number, because the mean of its divisors is an integer number (1342405).

2^2684809 is an apocalyptic number.

It is an amenable number.

2684809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2684809 is an equidigital number, since it uses as much as digits as its factorization.

2684809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 2684809 is about 1638.5386782130. The cubic root of 2684809 is about 138.9860241629.

The spelling of 2684809 in words is "two million, six hundred eighty-four thousand, eight hundred nine".