2189855736 has 96 divisors (see below), whose sum is σ = 6198192000. Its totient is φ = 724295520.

The previous prime is 2189855713. The next prime is 2189855753. The reversal of 2189855736 is 6375589812.

2189855736 is a `hidden beast` number, since 2 + 1 + 89 + 8 + 557 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 250365 + ... + 258963.

It is an arithmetic number, because the mean of its divisors is an integer number (64564500).

Almost surely, 2^2189855736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2189855736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3099096000).

2189855736 is an abundant number, since it is smaller than the sum of its proper divisors (4008336264).

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

2189855736 is a wasteful number, since it uses less digits than its factorization.

2189855736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8751 (or 8735 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 54.

The square root of 2189855736 is about 46795.8944353028. The cubic root of 2189855736 is about 1298.5893447750.

The spelling of 2189855736 in words is "two billion, one hundred eighty-nine million, eight hundred fifty-five thousand, seven hundred thirty-six".