8521803 has 24 divisors (see below), whose sum is σ = 12800528. Its totient is φ = 5458752.

The previous prime is 8521789. The next prime is 8521813. The reversal of 8521803 is 3081258.

It is a happy number.

It is not a de Polignac number, because 8521803 - 2⁴ = 8521787 is a prime.

It is a super-2 number, since 2×8521803² = 145242252741618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8521813) 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 23 ways as a sum of consecutive naturals, for example, 52200 + ... + 52362.

Almost surely, 2^8521803 is an apocalyptic number.

8521803 is a deficient number, since it is larger than the sum of its proper divisors (4278725).

8521803 is a wasteful number, since it uses less digits than its factorization.

8521803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363 (or 360 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 8521803 is about 2919.2127363383. The cubic root of 8521803 is about 204.2571008689.

The spelling of 8521803 in words is "eight million, five hundred twenty-one thousand, eight hundred three".