8991394 has 4 divisors (see below), whose sum is σ = 13487094. Its totient is φ = 4495696.

The previous prime is 8991383. The next prime is 8991401. The reversal of 8991394 is 4931998.

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., 7634169 + 1357225 = 2763^2 + 1165^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 8991394.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2247847 + ... + 2247850.

Almost surely, 2^8991394 is an apocalyptic number.

8991394 is a deficient number, since it is larger than the sum of its proper divisors (4495700).

8991394 is a wasteful number, since it uses less digits than its factorization.

8991394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4495699.

The product of its digits is 69984, while the sum is 43.

The square root of 8991394 is about 2998.5653236173. The cubic root of 8991394 is about 207.9420604154.

The spelling of 8991394 in words is "eight million, nine hundred ninety-one thousand, three hundred ninety-four".