1891389472 has 24 divisors (see below), whose sum is σ = 4255626816. Its totient is φ = 810595392.

The previous prime is 1891389469. The next prime is 1891389497. The reversal of 1891389472 is 2749831981.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4221628 + ... + 4222075.

It is an arithmetic number, because the mean of its divisors is an integer number (177317784).

Almost surely, 2^1891389472 is an apocalyptic number.

It is an amenable number.

1891389472 is an abundant number, since it is smaller than the sum of its proper divisors (2364237344).

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

1891389472 is an equidigital number, since it uses as much as digits as its factorization.

1891389472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8443720 (or 8443712 counting only the distinct ones).

The product of its digits is 870912, while the sum is 52.

The square root of 1891389472 is about 43490.1077487743. The cubic root of 1891389472 is about 1236.6885004084.

The spelling of 1891389472 in words is "one billion, eight hundred ninety-one million, three hundred eighty-nine thousand, four hundred seventy-two".