2540209 has 12 divisors (see below), whose sum is σ = 3020544. Its totient is φ = 2129064.

The previous prime is 2540203. The next prime is 2540231. The reversal of 2540209 is 9020452.

It is a happy number.

It is not a de Polignac number, because 2540209 - 2³ = 2540201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2540209.

It is not an unprimeable number, because it can be changed into a prime (2540201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1752 + ... + 2854.

It is an arithmetic number, because the mean of its divisors is an integer number (251712).

2^2540209 is an apocalyptic number.

It is an amenable number.

2540209 is a deficient number, since it is larger than the sum of its proper divisors (480335).

2540209 is a wasteful number, since it uses less digits than its factorization.

2540209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164 (or 1157 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 2540209 is about 1593.8033128338. The cubic root of 2540209 is about 136.4446411502. Note that the first 3 decimals are identical.

The spelling of 2540209 in words is "two million, five hundred forty thousand, two hundred nine".