2109399 has 16 divisors (see below), whose sum is σ = 3091200. Its totient is φ = 1273536.

The previous prime is 2109391. The next prime is 2109403. The reversal of 2109399 is 9939012.

It is not a de Polignac number, because 2109399 - 2³ = 2109391 is a prime.

It is an Ulam number.

2109399 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2109391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 507 + ... + 2115.

It is an arithmetic number, because the mean of its divisors is an integer number (193200).

2^2109399 is an apocalyptic number.

2109399 is a deficient number, since it is larger than the sum of its proper divisors (981801).

2109399 is a wasteful number, since it uses less digits than its factorization.

2109399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 2109399 is about 1452.3770171688. The cubic root of 2109399 is about 128.2486823921.

The spelling of 2109399 in words is "two million, one hundred nine thousand, three hundred ninety-nine".