2125640844 has 36 divisors (see below), whose sum is σ = 5498108616. Its totient is φ = 692068608.

The previous prime is 2125640833. The next prime is 2125640851. The reversal of 2125640844 is 4480465212.

2125640844 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 640 + 8 + 4 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2125640799 and 2125640808.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 685029 + ... + 688124.

Almost surely, 2^2125640844 is an apocalyptic number.

It is an amenable number.

2125640844 is an abundant number, since it is smaller than the sum of its proper divisors (3372467772).

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

2125640844 is a wasteful number, since it uses less digits than its factorization.

2125640844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373206 (or 1373201 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 36.

The square root of 2125640844 is about 46104.6726916047. The cubic root of 2125640844 is about 1285.7700208008.

The spelling of 2125640844 in words is "two billion, one hundred twenty-five million, six hundred forty thousand, eight hundred forty-four".