2520209 has 4 divisors (see below), whose sum is σ = 2538480. Its totient is φ = 2501940.

The previous prime is 2520191. The next prime is 2520211. The reversal of 2520209 is 9020252.

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 2520209 - 2⁸ = 2519953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2522209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8927 + ... + 9204.

It is an arithmetic number, because the mean of its divisors is an integer number (634620).

2^2520209 is an apocalyptic number.

It is an amenable number.

2520209 is a deficient number, since it is larger than the sum of its proper divisors (18271).

2520209 is a wasteful number, since it uses less digits than its factorization.

2520209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18270.

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

The square root of 2520209 is about 1587.5166140863. The cubic root of 2520209 is about 136.0856042660.

The spelling of 2520209 in words is "two million, five hundred twenty thousand, two hundred nine".