8730021 has 4 divisors (see below), whose sum is σ = 11640032. Its totient is φ = 5820012.

The previous prime is 8730013. The next prime is 8730049. The reversal of 8730021 is 1200378.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 8730021 - 2³ = 8730013 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 8730021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8730091) 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, 1455001 + ... + 1455006.

It is an arithmetic number, because the mean of its divisors is an integer number (2910008).

Almost surely, 2^8730021 is an apocalyptic number.

It is an amenable number.

8730021 is a deficient number, since it is larger than the sum of its proper divisors (2910011).

8730021 is a wasteful number, since it uses less digits than its factorization.

8730021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2910010.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 8730021 is about 2954.6608942483. The cubic root of 8730021 is about 205.9073089764.

Adding to 8730021 its reverse (1200378), we get a palindrome (9930399).

The spelling of 8730021 in words is "eight million, seven hundred thirty thousand, twenty-one".