1891338996 has 12 divisors (see below), whose sum is σ = 4413124352. Its totient is φ = 630446328.

The previous prime is 1891338959. The next prime is 1891338997. The reversal of 1891338996 is 6998331981.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891338997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78805780 + ... + 78805803.

Almost surely, 2^1891338996 is an apocalyptic number.

It is an amenable number.

1891338996 is an abundant number, since it is smaller than the sum of its proper divisors (2521785356).

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

1891338996 is a wasteful number, since it uses less digits than its factorization.

1891338996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157611590 (or 157611588 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 57.

The square root of 1891338996 is about 43489.5274290259. The cubic root of 1891338996 is about 1236.6774990353.

The spelling of 1891338996 in words is "one billion, eight hundred ninety-one million, three hundred thirty-eight thousand, nine hundred ninety-six".