8999421 has 4 divisors (see below), whose sum is σ = 11999232. Its totient is φ = 5999612.

The previous prime is 8999411. The next prime is 8999423. The reversal of 8999421 is 1249998.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8999421 - 2¹⁰ = 8998397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8999423) 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 3 ways as a sum of consecutive naturals, for example, 1499901 + ... + 1499906.

It is an arithmetic number, because the mean of its divisors is an integer number (2999808).

Almost surely, 2^8999421 is an apocalyptic number.

It is an amenable number.

8999421 is a deficient number, since it is larger than the sum of its proper divisors (2999811).

8999421 is a wasteful number, since it uses less digits than its factorization.

8999421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2999810.

The product of its digits is 46656, while the sum is 42.

The square root of 8999421 is about 2999.9034984479. The cubic root of 8999421 is about 208.0039215853.

The spelling of 8999421 in words is "eight million, nine hundred ninety-nine thousand, four hundred twenty-one".