2408309 has 2 divisors, whose sum is σ = 2408310. Its totient is φ = 2408308.

The previous prime is 2408303. The next prime is 2408311. The reversal of 2408309 is 9038042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2102500 + 305809 = 1450^2 + 553^2 .

It is a cyclic number.

It is not a de Polignac number, because 2408309 - 2¹⁶ = 2342773 is a prime.

It is a Sophie Germain prime.

Together with 2408311, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2408303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1204154 + 1204155.

It is an arithmetic number, because the mean of its divisors is an integer number (1204155).

2^2408309 is an apocalyptic number.

It is an amenable number.

2408309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2408309 is an equidigital number, since it uses as much as digits as its factorization.

2408309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 2408309 is about 1551.8727396278. The cubic root of 2408309 is about 134.0409208951.

It can be divided in two parts, 2 and 408309, that multiplied together give a palindrome (816618).

The spelling of 2408309 in words is "two million, four hundred eight thousand, three hundred nine".