8905921 has 4 divisors (see below), whose sum is σ = 8914644. Its totient is φ = 8897200.

The previous prime is 8905913. The next prime is 8905933. The reversal of 8905921 is 1295098.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4682896 + 4223025 = 2164^2 + 2055^2 .

It is a cyclic number.

It is not a de Polignac number, because 8905921 - 2³ = 8905913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8905021) 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 3 ways as a sum of consecutive naturals, for example, 2590 + ... + 4951.

It is an arithmetic number, because the mean of its divisors is an integer number (2228661).

Almost surely, 2^8905921 is an apocalyptic number.

It is an amenable number.

8905921 is a deficient number, since it is larger than the sum of its proper divisors (8723).

8905921 is a wasteful number, since it uses less digits than its factorization.

8905921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8722.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 8905921 is about 2984.2789748949. The cubic root of 8905921 is about 207.2810561384.

The spelling of 8905921 in words is "eight million, nine hundred five thousand, nine hundred twenty-one".