8303921 has 4 divisors (see below), whose sum is σ = 8310372. Its totient is φ = 8297472.

The previous prime is 8303909. The next prime is 8303923. The reversal of 8303921 is 1293038.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1293038 = 2 ⋅646519.

It can be written as a sum of positive squares in 2 ways, for example, as 6451600 + 1852321 = 2540^2 + 1361^2 .

It is a cyclic number.

It is not a de Polignac number, because 8303921 - 2⁶ = 8303857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8303923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 560 + ... + 4113.

It is an arithmetic number, because the mean of its divisors is an integer number (2077593).

Almost surely, 2^8303921 is an apocalyptic number.

It is an amenable number.

8303921 is a deficient number, since it is larger than the sum of its proper divisors (6451).

8303921 is a wasteful number, since it uses less digits than its factorization.

8303921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6450.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 8303921 is about 2881.6524773123. The cubic root of 8303921 is about 202.5012630110.

Adding to 8303921 its reverse (1293038), we get a palindrome (9596959).

The spelling of 8303921 in words is "eight million, three hundred three thousand, nine hundred twenty-one".