1890781686993 has 16 divisors (see below), whose sum is σ = 2608179379200. Its totient is φ = 1216959381120.

The previous prime is 1890781686953. The next prime is 1890781687037. The reversal of 1890781686993 is 3996861870981.

It is not a de Polignac number, because 1890781686993 - 2¹² = 1890781682897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1890781686943) 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, 270928 + ... + 1963406.

It is an arithmetic number, because the mean of its divisors is an integer number (163011211200).

Almost surely, 2^{1890781686993} is an apocalyptic number.

It is an amenable number.

1890781686993 is a deficient number, since it is larger than the sum of its proper divisors (717397692207).

1890781686993 is a wasteful number, since it uses less digits than its factorization.

1890781686993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1705352.

The product of its (nonzero) digits is 282175488, while the sum is 75.

The spelling of 1890781686993 in words is "one trillion, eight hundred ninety billion, seven hundred eighty-one million, six hundred eighty-six thousand, nine hundred ninety-three".