1891132928 has 80 divisors (see below), whose sum is σ = 4106403840. Its totient is φ = 866764800.

The previous prime is 1891132927. The next prime is 1891132939. The reversal of 1891132928 is 8292311981.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891132927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 298433 + ... + 304703.

It is an arithmetic number, because the mean of its divisors is an integer number (51330048).

Almost surely, 2^1891132928 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 1891132928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2053201920).

1891132928 is an abundant number, since it is smaller than the sum of its proper divisors (2215270912).

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

1891132928 is an equidigital number, since it uses as much as digits as its factorization.

1891132928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6339 (or 6323 counting only the distinct ones).

The product of its digits is 62208, while the sum is 44.

The square root of 1891132928 is about 43487.1581964147. The cubic root of 1891132928 is about 1236.6325839575.

The spelling of 1891132928 in words is "one billion, eight hundred ninety-one million, one hundred thirty-two thousand, nine hundred twenty-eight".