8403521 has 8 divisors (see below), whose sum is σ = 9785664. Its totient is φ = 7066800.

The previous prime is 8403517. The next prime is 8403557. The reversal of 8403521 is 1253048.

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

It is a cyclic number.

It is not a de Polignac number, because 8403521 - 2² = 8403517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8403121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10955 + ... + 11696.

It is an arithmetic number, because the mean of its divisors is an integer number (1223208).

Almost surely, 2^8403521 is an apocalyptic number.

It is an amenable number.

8403521 is a deficient number, since it is larger than the sum of its proper divisors (1382143).

8403521 is a wasteful number, since it uses less digits than its factorization.

8403521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22711.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 8403521 is about 2898.8827158062. The cubic root of 8403521 is about 203.3076700269.

Adding to 8403521 its reverse (1253048), we get a palindrome (9656569).

The spelling of 8403521 in words is "eight million, four hundred three thousand, five hundred twenty-one".