2109812 has 6 divisors (see below), whose sum is σ = 3692178. Its totient is φ = 1054904.

The previous prime is 2109799. The next prime is 2109841. The reversal of 2109812 is 2189012.

It can be written as a sum of positive squares in only one way, i.e., 1628176 + 481636 = 1276^2 + 694^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 263723 + ... + 263730.

It is an arithmetic number, because the mean of its divisors is an integer number (615363).

2^2109812 is an apocalyptic number.

It is an amenable number.

2109812 is a deficient number, since it is larger than the sum of its proper divisors (1582366).

2109812 is a wasteful number, since it uses less digits than its factorization.

2109812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527457 (or 527455 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 2109812 is about 1452.5191909231. The cubic root of 2109812 is about 128.2570517980.

The spelling of 2109812 in words is "two million, one hundred nine thousand, eight hundred twelve".