2109506 has 16 divisors (see below), whose sum is σ = 3685824. Its totient is φ = 886704.

The previous prime is 2109461. The next prime is 2109509. The reversal of 2109506 is 6059012.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2109509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 680 + ... + 2163.

It is an arithmetic number, because the mean of its divisors is an integer number (230364).

2^2109506 is an apocalyptic number.

2109506 is a deficient number, since it is larger than the sum of its proper divisors (1576318).

2109506 is a wasteful number, since it uses less digits than its factorization.

2109506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2905.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 2109506 is about 1452.4138528670. The cubic root of 2109506 is about 128.2508508418.

The spelling of 2109506 in words is "two million, one hundred nine thousand, five hundred six".