2100904 has 16 divisors (see below), whose sum is σ = 4242420. Its totient is φ = 969600.

The previous prime is 2100899. The next prime is 2100913. The reversal of 2100904 is 4090012.

It can be written as a sum of positive squares in 2 ways, for example, as 1464100 + 636804 = 1210^2 + 798^2 .

It is an unprimeable number.

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, 9997 + ... + 10204.

2^2100904 is an apocalyptic number.

It is an amenable number.

2100904 is an abundant number, since it is smaller than the sum of its proper divisors (2141516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2100904 is a wasteful number, since it uses less digits than its factorization.

2100904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20220 (or 20216 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2100904 is about 1449.4495506916. The cubic root of 2100904 is about 128.0762891574.

Adding to 2100904 its reverse (4090012), we get a palindrome (6190916).

The spelling of 2100904 in words is "two million, one hundred thousand, nine hundred four".