8713821 has 16 divisors (see below), whose sum is σ = 12277760. Its totient is φ = 5488560.

The previous prime is 8713813. The next prime is 8713823. The reversal of 8713821 is 1283178.

It is a happy number.

It is not a de Polignac number, because 8713821 - 2³ = 8713813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8713823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2910 + ... + 5088.

It is an arithmetic number, because the mean of its divisors is an integer number (767360).

Almost surely, 2^8713821 is an apocalyptic number.

It is an amenable number.

8713821 is a deficient number, since it is larger than the sum of its proper divisors (3563939).

8713821 is a wasteful number, since it uses less digits than its factorization.

8713821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256.

The product of its digits is 2688, while the sum is 30.

The square root of 8713821 is about 2951.9181899233. The cubic root of 8713821 is about 205.7798650734.

Adding to 8713821 its reverse (1283178), we get a palindrome (9996999).

The spelling of 8713821 in words is "eight million, seven hundred thirteen thousand, eight hundred twenty-one".