9991418 has 4 divisors (see below), whose sum is σ = 14987130. Its totient is φ = 4995708.

The previous prime is 9991409. The next prime is 9991433. The reversal of 9991418 is 8141999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5094049 + 4897369 = 2257^2 + 2213^2 .

It is an unprimeable number.

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, 2497853 + ... + 2497856.

Almost surely, 2^9991418 is an apocalyptic number.

9991418 is a deficient number, since it is larger than the sum of its proper divisors (4995712).

9991418 is a wasteful number, since it uses less digits than its factorization.

9991418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4995711.

The product of its digits is 23328, while the sum is 41.

The square root of 9991418 is about 3160.9204355694. The cubic root of 9991418 is about 215.3818201691.

The spelling of 9991418 in words is "nine million, nine hundred ninety-one thousand, four hundred eighteen".