1891328712 has 64 divisors (see below), whose sum is σ = 5819479680. Its totient is φ = 498811392.

The previous prime is 1891328711. The next prime is 1891328713. The reversal of 1891328712 is 2178231981.

It is an interprime number because it is at equal distance from previous prime (1891328711) and next prime (1891328713).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (1891328711) 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, 430813 + ... + 435180.

It is an arithmetic number, because the mean of its divisors is an integer number (90929370).

Almost surely, 2^1891328712 is an apocalyptic number.

1891328712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1891328712 is an abundant number, since it is smaller than the sum of its proper divisors (3928150968).

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

1891328712 is a wasteful number, since it uses less digits than its factorization.

1891328712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866022 (or 866018 counting only the distinct ones).

The product of its digits is 48384, while the sum is 42.

The square root of 1891328712 is about 43489.4091935037. The cubic root of 1891328712 is about 1236.6752575872.

The spelling of 1891328712 in words is "one billion, eight hundred ninety-one million, three hundred twenty-eight thousand, seven hundred twelve".