2345809 has 2 divisors, whose sum is σ = 2345810. Its totient is φ = 2345808.

The previous prime is 2345807. The next prime is 2345831. The reversal of 2345809 is 9085432.

2345809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2334784 + 11025 = 1528^2 + 105^2 .

It is a cyclic number.

It is not a de Polignac number, because 2345809 - 2¹ = 2345807 is a prime.

Together with 2345807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2345803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1172904 + 1172905.

It is an arithmetic number, because the mean of its divisors is an integer number (1172905).

2^2345809 is an apocalyptic number.

It is an amenable number.

2345809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2345809 is an equidigital number, since it uses as much as digits as its factorization.

2345809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 2345809 is about 1531.6034081968. The cubic root of 2345809 is about 132.8712077892.

The spelling of 2345809 in words is "two million, three hundred forty-five thousand, eight hundred nine".