9871997894 has 8 divisors (see below), whose sum is σ = 16154178408. Its totient is φ = 4487271760.

The previous prime is 9871997881. The next prime is 9871997897. The reversal of 9871997894 is 4987991789.

9871997894 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9871997897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224363567 + ... + 224363610.

It is an arithmetic number, because the mean of its divisors is an integer number (2019272301).

Almost surely, 2^9871997894 is an apocalyptic number.

9871997894 is a deficient number, since it is larger than the sum of its proper divisors (6282180514).

9871997894 is a wasteful number, since it uses less digits than its factorization.

9871997894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448727190.

The product of its digits is 82301184, while the sum is 71.

The square root of 9871997894 is about 99357.9281889473. The cubic root of 9871997894 is about 2145.2027812196.

The spelling of 9871997894 in words is "nine billion, eight hundred seventy-one million, nine hundred ninety-seven thousand, eight hundred ninety-four".