8445921 has 24 divisors (see below), whose sum is σ = 12640320. Its totient is φ = 5010720.

The previous prime is 8445917. The next prime is 8445929. The reversal of 8445921 is 1295448.

8445921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8445921 - 2² = 8445917 is a prime.

It is a super-3 number, since 3×8445921³ (a number of 22 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (8445929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19020 + ... + 19458.

It is an arithmetic number, because the mean of its divisors is an integer number (526680).

Almost surely, 2^8445921 is an apocalyptic number.

It is an amenable number.

8445921 is a deficient number, since it is larger than the sum of its proper divisors (4194399).

8445921 is a wasteful number, since it uses less digits than its factorization.

8445921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517 (or 506 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 8445921 is about 2906.1866767295. The cubic root of 8445921 is about 203.6490264609.

The spelling of 8445921 in words is "eight million, four hundred forty-five thousand, nine hundred twenty-one".