2143878786 has 64 divisors (see below), whose sum is σ = 5454408960. Its totient is φ = 611452800.

The previous prime is 2143878773. The next prime is 2143878787. The reversal of 2143878786 is 6878783412.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (2143878787) 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 31 ways as a sum of consecutive naturals, for example, 222460 + ... + 231896.

It is an arithmetic number, because the mean of its divisors is an integer number (85225140).

Almost surely, 2^2143878786 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2143878786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2727204480).

2143878786 is an abundant number, since it is smaller than the sum of its proper divisors (3310530174).

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

2143878786 is a wasteful number, since it uses less digits than its factorization.

2143878786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10056 (or 10050 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 54.

The square root of 2143878786 is about 46302.0386808184. The cubic root of 2143878786 is about 1289.4368445067.

The spelling of 2143878786 in words is "two billion, one hundred forty-three million, eight hundred seventy-eight thousand, seven hundred eighty-six".