2540009 has 4 divisors (see below), whose sum is σ = 2583120. Its totient is φ = 2496900.

The previous prime is 2539997. The next prime is 2540011. The reversal of 2540009 is 9000452.

2540009 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.

It is a cyclic number.

It is not a de Polignac number, because 2540009 - 2⁸ = 2539753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2540099) 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, 21467 + ... + 21584.

It is an arithmetic number, because the mean of its divisors is an integer number (645780).

2^2540009 is an apocalyptic number.

It is an amenable number.

2540009 is a deficient number, since it is larger than the sum of its proper divisors (43111).

2540009 is an equidigital number, since it uses as much as digits as its factorization.

2540009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43110.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 2540009 is about 1593.7405685995. The cubic root of 2540009 is about 136.4410601267.

The spelling of 2540009 in words is "two million, five hundred forty thousand, nine".