2109872 has 20 divisors (see below), whose sum is σ = 4118040. Its totient is φ = 1047168.

The previous prime is 2109871. The next prime is 2109889. The reversal of 2109872 is 2789012.

It is a happy number.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (2109871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2204 + ... + 3012.

It is an arithmetic number, because the mean of its divisors is an integer number (205902).

2^2109872 is an apocalyptic number.

It is an amenable number.

2109872 is a deficient number, since it is larger than the sum of its proper divisors (2008168).

2109872 is a wasteful number, since it uses less digits than its factorization.

2109872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980 (or 974 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 2109872 is about 1452.5398445482. The cubic root of 2109872 is about 128.2582676014.

The spelling of 2109872 in words is "two million, one hundred nine thousand, eight hundred seventy-two".