2009399 has 4 divisors (see below), whose sum is σ = 2296464. Its totient is φ = 1722336.

The previous prime is 2009393. The next prime is 2009407. The reversal of 2009399 is 9939002.

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

It is not a de Polignac number, because 2009399 - 2¹⁶ = 1943863 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 (2009393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143522 + ... + 143535.

It is an arithmetic number, because the mean of its divisors is an integer number (574116).

2^2009399 is an apocalyptic number.

2009399 is a deficient number, since it is larger than the sum of its proper divisors (287065).

2009399 is an equidigital number, since it uses as much as digits as its factorization.

2009399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287064.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 2009399 is about 1417.5327156718. The cubic root of 2009399 is about 126.1891632518.

The spelling of 2009399 in words is "two million, nine thousand, three hundred ninety-nine".