8991423 has 36 divisors (see below), whose sum is σ = 15467088. Its totient is φ = 4927680.

The previous prime is 8991401. The next prime is 8991431. The reversal of 8991423 is 3241998.

It is not a de Polignac number, because 8991423 - 2⁸ = 8991167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8991443) 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 in 35 ways as a sum of consecutive naturals, for example, 152368 + ... + 152426.

Almost surely, 2^8991423 is an apocalyptic number.

8991423 is a deficient number, since it is larger than the sum of its proper divisors (6475665).

8991423 is a wasteful number, since it uses less digits than its factorization.

8991423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 110 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 8991423 is about 2998.5701592592. The cubic root of 8991423 is about 207.9422839741.

The spelling of 8991423 in words is "eight million, nine hundred ninety-one thousand, four hundred twenty-three".