2405509 has 2 divisors, whose sum is σ = 2405510. Its totient is φ = 2405508.

The previous prime is 2405497. The next prime is 2405527. The reversal of 2405509 is 9055042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2356225 + 49284 = 1535^2 + 222^2 .

It is a cyclic number.

It is not a de Polignac number, because 2405509 - 2¹⁹ = 1881221 is a prime.

2405509 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2405539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1202754 + 1202755.

It is an arithmetic number, because the mean of its divisors is an integer number (1202755).

2^2405509 is an apocalyptic number.

It is an amenable number.

2405509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2405509 is an equidigital number, since it uses as much as digits as its factorization.

2405509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 2405509 is about 1550.9703414315. The cubic root of 2405509 is about 133.9889535707.

The spelling of 2405509 in words is "two million, four hundred five thousand, five hundred nine".