1891868434912 has 48 divisors (see below), whose sum is σ = 3892563827712. Its totient is φ = 903407950720.

The previous prime is 1891868434903. The next prime is 1891868434927. The reversal of 1891868434912 is 2194348681981.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1510264 + ... + 2462647.

It is an arithmetic number, because the mean of its divisors is an integer number (81095079744).

Almost surely, 2^{1891868434912} is an apocalyptic number.

It is an amenable number.

1891868434912 is an abundant number, since it is smaller than the sum of its proper divisors (2000695392800).

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

1891868434912 is a wasteful number, since it uses less digits than its factorization.

1891868434912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3973591 (or 3973583 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 64.

The spelling of 1891868434912 in words is "one trillion, eight hundred ninety-one billion, eight hundred sixty-eight million, four hundred thirty-four thousand, nine hundred twelve".