8499921 has 8 divisors (see below), whose sum is σ = 11698944. Its totient is φ = 5483760.

The previous prime is 8499917. The next prime is 8499937. The reversal of 8499921 is 1299948.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8499921 - 2² = 8499917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8499971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45606 + ... + 45791.

It is an arithmetic number, because the mean of its divisors is an integer number (1462368).

Almost surely, 2^8499921 is an apocalyptic number.

It is an amenable number.

8499921 is a deficient number, since it is larger than the sum of its proper divisors (3199023).

8499921 is a wasteful number, since it uses less digits than its factorization.

8499921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91431.

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

The square root of 8499921 is about 2915.4623990029. The cubic root of 8499921 is about 204.0821228375.

The spelling of 8499921 in words is "eight million, four hundred ninety-nine thousand, nine hundred twenty-one".