2109925 has 12 divisors (see below), whose sum is σ = 2688196. Its totient is φ = 1641600.

The previous prime is 2109911. The next prime is 2109941. The reversal of 2109925 is 5299012.

2109925 = 131² + 132² + ... + 204².

It can be written as a sum of positive squares in 6 ways, for example, as 39204 + 2070721 = 198^2 + 1439^2 .

It is not a de Polignac number, because 2109925 - 2⁷ = 2109797 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 2109893 and 2109902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 216 + ... + 2065.

2^2109925 is an apocalyptic number.

2109925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2109925 is a deficient number, since it is larger than the sum of its proper divisors (578271).

2109925 is a wasteful number, since it uses less digits than its factorization.

2109925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2328 (or 2323 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 2109925 is about 1452.5580883393. The cubic root of 2109925 is about 128.2593415420.

The spelling of 2109925 in words is "two million, one hundred nine thousand, nine hundred twenty-five".