9817994 has 4 divisors (see below), whose sum is σ = 14726994. Its totient is φ = 4908996.

The previous prime is 9817991. The next prime is 9818009. The reversal of 9817994 is 4997189.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4997189 = 139 ⋅35951.

It can be written as a sum of positive squares in only one way, i.e., 8094025 + 1723969 = 2845^2 + 1313^2 .

It is not an unprimeable number, because it can be changed into a prime (9817991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2454497 + ... + 2454500.

Almost surely, 2^9817994 is an apocalyptic number.

9817994 is a deficient number, since it is larger than the sum of its proper divisors (4909000).

9817994 is a wasteful number, since it uses less digits than its factorization.

9817994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4908999.

The product of its digits is 163296, while the sum is 47.

The square root of 9817994 is about 3133.3678366895. The cubic root of 9817994 is about 214.1283912347.

The spelling of 9817994 in words is "nine million, eight hundred seventeen thousand, nine hundred ninety-four".