2189871756 has 36 divisors (see below), whose sum is σ = 5539100112. Its totient is φ = 729483744.

The previous prime is 2189871743. The next prime is 2189871767. The reversal of 2189871756 is 6571789812.

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

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, 38926 + ... + 76778.

It is an arithmetic number, because the mean of its divisors is an integer number (153863892).

Almost surely, 2^2189871756 is an apocalyptic number.

It is an amenable number.

2189871756 is an abundant number, since it is smaller than the sum of its proper divisors (3349228356).

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

2189871756 is a wasteful number, since it uses less digits than its factorization.

2189871756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39470 (or 39465 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 54.

The square root of 2189871756 is about 46796.0656038518. The cubic root of 2189871756 is about 1298.5925113992.

The spelling of 2189871756 in words is "two billion, one hundred eighty-nine million, eight hundred seventy-one thousand, seven hundred fifty-six".