2399609 has 4 divisors (see below), whose sum is σ = 2409204. Its totient is φ = 2390016.

The previous prime is 2399599. The next prime is 2399611. The reversal of 2399609 is 9069932.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2325625 + 73984 = 1525^2 + 272^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2399609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2399629) 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, 4412 + ... + 4925.

It is an arithmetic number, because the mean of its divisors is an integer number (602301).

2^2399609 is an apocalyptic number.

It is an amenable number.

2399609 is a deficient number, since it is larger than the sum of its proper divisors (9595).

2399609 is an equidigital number, since it uses as much as digits as its factorization.

2399609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9594.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 2399609 is about 1549.0671386354. The cubic root of 2399609 is about 133.8793188359.

The spelling of 2399609 in words is "two million, three hundred ninety-nine thousand, six hundred nine".