9894191993 has 8 divisors (see below), whose sum is σ = 11902787520. Its totient is φ = 8034381360.

The previous prime is 9894191939. The next prime is 9894192019. The reversal of 9894191993 is 3991914989.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 9894191993 - 2¹⁶ = 9894126457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9894191933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37196078 + ... + 37196343.

It is an arithmetic number, because the mean of its divisors is an integer number (1487848440).

Almost surely, 2^9894191993 is an apocalyptic number.

It is an amenable number.

9894191993 is a deficient number, since it is larger than the sum of its proper divisors (2008595527).

9894191993 is a wasteful number, since it uses less digits than its factorization.

9894191993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74392447.

The product of its digits is 5668704, while the sum is 62.

The square root of 9894191993 is about 99469.5530954070. The cubic root of 9894191993 is about 2146.8091837786.

The spelling of 9894191993 in words is "nine billion, eight hundred ninety-four million, one hundred ninety-one thousand, nine hundred ninety-three".