1891133892 has 48 divisors (see below), whose sum is σ = 4963492800. Its totient is φ = 630375048.

The previous prime is 1891133891. The next prime is 1891133927. The reversal of 1891133892 is 2983311981.

It is not an unprimeable number, because it can be changed into a prime (1891133891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99342 + ... + 116837.

It is an arithmetic number, because the mean of its divisors is an integer number (103406100).

Almost surely, 2^1891133892 is an apocalyptic number.

1891133892 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1891133892 is an abundant number, since it is smaller than the sum of its proper divisors (3072358908).

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

1891133892 is an equidigital number, since it uses as much as digits as its factorization.

1891133892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216204 (or 216184 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 1891133892 is about 43487.1692801451. The cubic root of 1891133892 is about 1236.6327940808.

The spelling of 1891133892 in words is "one billion, eight hundred ninety-one million, one hundred thirty-three thousand, eight hundred ninety-two".