8991427 has 6 divisors (see below), whose sum is σ = 9489948. Its totient is φ = 8517852.

The previous prime is 8991401. The next prime is 8991431. The reversal of 8991427 is 7241998.

It is not a de Polignac number, because 8991427 - 2⁷ = 8991299 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8991427.

It is not an unprimeable number, because it can be changed into a prime (8991127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12093 + ... + 12814.

It is an arithmetic number, because the mean of its divisors is an integer number (1581658).

Almost surely, 2^8991427 is an apocalyptic number.

8991427 is a deficient number, since it is larger than the sum of its proper divisors (498521).

8991427 is a wasteful number, since it uses less digits than its factorization.

8991427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24945 (or 24926 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 8991427 is about 2998.5708262437. The cubic root of 8991427 is about 207.9423148097.

The spelling of 8991427 in words is "eight million, nine hundred ninety-one thousand, four hundred twenty-seven".