1897891126887 has 16 divisors (see below), whose sum is σ = 2892108465920. Its totient is φ = 1084477756032.

The previous prime is 1897891126883. The next prime is 1897891126913. The reversal of 1897891126887 is 7886211987981.

It is not a de Polignac number, because 1897891126887 - 2² = 1897891126883 is a prime.

It is a Smith number, since the sum of its digits (75) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1897891126883) 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, 559618 + ... + 2027055.

It is an arithmetic number, because the mean of its divisors is an integer number (180756779120).

Almost surely, 2^{1897891126887} is an apocalyptic number.

1897891126887 is a deficient number, since it is larger than the sum of its proper divisors (994217339033).

1897891126887 is a wasteful number, since it uses less digits than its factorization.

1897891126887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2621622.

The product of its digits is 195084288, while the sum is 75.

The spelling of 1897891126887 in words is "one trillion, eight hundred ninety-seven billion, eight hundred ninety-one million, one hundred twenty-six thousand, eight hundred eighty-seven".