2406509 has 4 divisors (see below), whose sum is σ = 2750304. Its totient is φ = 2062716.

The previous prime is 2406479. The next prime is 2406529. The reversal of 2406509 is 9056042.

2406509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9056042 = 2 ⋅4528021.

It is a cyclic number.

It is not a de Polignac number, because 2406509 - 2¹⁶ = 2340973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2406529) 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 in 3 ways as a sum of consecutive naturals, for example, 171887 + ... + 171900.

It is an arithmetic number, because the mean of its divisors is an integer number (687576).

2^2406509 is an apocalyptic number.

It is an amenable number.

2406509 is a deficient number, since it is larger than the sum of its proper divisors (343795).

2406509 is an equidigital number, since it uses as much as digits as its factorization.

2406509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343794.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2406509 is about 1551.2926867616. The cubic root of 2406509 is about 134.0075179565.

The spelling of 2406509 in words is "two million, four hundred six thousand, five hundred nine".