1891228818 has 64 divisors (see below), whose sum is σ = 4075868160. Its totient is φ = 582912000.

The previous prime is 1891228813. The next prime is 1891228831. The reversal of 1891228818 is 8188221981.

1891228818 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×1891228818³ (a number of 29 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1891228813) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1642543 + ... + 1643693.

It is an arithmetic number, because the mean of its divisors is an integer number (63685440).

Almost surely, 2^1891228818 is an apocalyptic number.

1891228818 is an abundant number, since it is smaller than the sum of its proper divisors (2184639342).

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

1891228818 is a wasteful number, since it uses less digits than its factorization.

1891228818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443.

The product of its digits is 147456, while the sum is 48.

The square root of 1891228818 is about 43488.2606918235. The cubic root of 1891228818 is about 1236.6534847788.

The spelling of 1891228818 in words is "one billion, eight hundred ninety-one million, two hundred twenty-eight thousand, eight hundred eighteen".