9991394 has 24 divisors (see below), whose sum is σ = 17846928. Its totient is φ = 4180680.

The previous prime is 9991379. The next prime is 9991409. The reversal of 9991394 is 4931999.

It is an interprime number because it is at equal distance from previous prime (9991379) and next prime (9991409).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3029 + ... + 5399.

It is an arithmetic number, because the mean of its divisors is an integer number (743622).

Almost surely, 2^9991394 is an apocalyptic number.

9991394 is a deficient number, since it is larger than the sum of its proper divisors (7855534).

9991394 is a wasteful number, since it uses less digits than its factorization.

9991394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430 (or 2423 counting only the distinct ones).

The product of its digits is 78732, while the sum is 44.

The square root of 9991394 is about 3160.9166392045. The cubic root of 9991394 is about 215.3816477155.

The spelling of 9991394 in words is "nine million, nine hundred ninety-one thousand, three hundred ninety-four".