1894998681 has 24 divisors (see below), whose sum is σ = 2882468160. Its totient is φ = 1197304416.

The previous prime is 1894998673. The next prime is 1894998713. The reversal of 1894998681 is 1868994981.

1894998681 is a `hidden beast` number, since 1 + 89 + 499 + 8 + 68 + 1 = 666.

1894998681 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1894998681 - 2³ = 1894998673 is a prime.

It is a super-2 number, since 2×1894998681² = 7182040001983479522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1894998601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19431 + ... + 64556.

It is an arithmetic number, because the mean of its divisors is an integer number (120102840).

Almost surely, 2^1894998681 is an apocalyptic number.

It is an amenable number.

1894998681 is a deficient number, since it is larger than the sum of its proper divisors (987469479).

1894998681 is a wasteful number, since it uses less digits than its factorization.

1894998681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84125 (or 84122 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 63.

The square root of 1894998681 is about 43531.5825694403. The cubic root of 1894998681 is about 1237.4746299054.

The spelling of 1894998681 in words is "one billion, eight hundred ninety-four million, nine hundred ninety-eight thousand, six hundred eighty-one".