1891961712 has 100 divisors (see below), whose sum is σ = 5524772880. Its totient is φ = 625024512.

The previous prime is 1891961707. The next prime is 1891961767. The reversal of 1891961712 is 2171691981.

It is a happy number.

1891961712 is a `hidden beast` number, since 1 + 8 + 9 + 19 + 617 + 12 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 139989 + ... + 152907.

Almost surely, 2^1891961712 is an apocalyptic number.

1891961712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1891961712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2762386440).

1891961712 is an abundant number, since it is smaller than the sum of its proper divisors (3632811168).

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

1891961712 is a wasteful number, since it uses less digits than its factorization.

1891961712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13052 (or 13037 counting only the distinct ones).

The product of its digits is 54432, while the sum is 45.

The square root of 1891961712 is about 43496.6862186075. The cubic root of 1891961712 is about 1236.8132078929.

The spelling of 1891961712 in words is "one billion, eight hundred ninety-one million, nine hundred sixty-one thousand, seven hundred twelve".