9891426994 has 8 divisors (see below), whose sum is σ = 15117086700. Its totient is φ = 4852398096.

The previous prime is 9891426953. The next prime is 9891427009. The reversal of 9891426994 is 4996241989.

9891426994 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 8530923769 + 1360503225 = 92363^2 + 36885^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46657569 + ... + 46657780.

Almost surely, 2^9891426994 is an apocalyptic number.

9891426994 is a deficient number, since it is larger than the sum of its proper divisors (5225659706).

9891426994 is a wasteful number, since it uses less digits than its factorization.

9891426994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93315404.

The product of its digits is 10077696, while the sum is 61.

The square root of 9891426994 is about 99455.6534039167. The cubic root of 9891426994 is about 2146.6091850223.

The spelling of 9891426994 in words is "nine billion, eight hundred ninety-one million, four hundred twenty-six thousand, nine hundred ninety-four".