2145778184 has 48 divisors (see below), whose sum is σ = 4433089500. Its totient is φ = 972984320.

The previous prime is 2145778183. The next prime is 2145778207. The reversal of 2145778184 is 4818775412.

It can be written as a sum of positive squares in 2 ways, for example, as 2144616100 + 1162084 = 46310^2 + 1078^2 .

It is not an unprimeable number, because it can be changed into a prime (2145778183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 432164 + ... + 437100.

Almost surely, 2^2145778184 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 2145778184, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2216544750).

2145778184 is an abundant number, since it is smaller than the sum of its proper divisors (2287311316).

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

2145778184 is a wasteful number, since it uses less digits than its factorization.

2145778184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5414 (or 5399 counting only the distinct ones).

The product of its digits is 501760, while the sum is 47.

The square root of 2145778184 is about 46322.5450941547. The cubic root of 2145778184 is about 1289.8175300269.

The spelling of 2145778184 in words is "two billion, one hundred forty-five million, seven hundred seventy-eight thousand, one hundred eighty-four".