8453921 has 12 divisors (see below), whose sum is σ = 9882432. Its totient is φ = 7231812.

The previous prime is 8453909. The next prime is 8453923. The reversal of 8453921 is 1293548.

It is not a de Polignac number, because 8453921 - 2¹⁴ = 8437537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8453923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16556 + ... + 17058.

It is an arithmetic number, because the mean of its divisors is an integer number (823536).

Almost surely, 2^8453921 is an apocalyptic number.

It is an amenable number.

8453921 is a deficient number, since it is larger than the sum of its proper divisors (1428511).

8453921 is an frugal number, since it uses more digits than its factorization.

8453921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538 (or 510 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 8453921 is about 2907.5627250328. The cubic root of 8453921 is about 203.7133051460.

The spelling of 8453921 in words is "eight million, four hundred fifty-three thousand, nine hundred twenty-one".