8684921 has 4 divisors (see below), whose sum is σ = 9925632. Its totient is φ = 7444212.

The previous prime is 8684911. The next prime is 8684939. The reversal of 8684921 is 1294868.

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 a cyclic number.

It is not a de Polignac number, because 8684921 - 2¹⁰ = 8683897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8684911) 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, 620345 + ... + 620358.

It is an arithmetic number, because the mean of its divisors is an integer number (2481408).

Almost surely, 2^8684921 is an apocalyptic number.

It is an amenable number.

8684921 is a deficient number, since it is larger than the sum of its proper divisors (1240711).

8684921 is a wasteful number, since it uses less digits than its factorization.

8684921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240710.

The product of its digits is 27648, while the sum is 38.

The square root of 8684921 is about 2947.0190023140. The cubic root of 8684921 is about 205.5521186450.

The spelling of 8684921 in words is "eight million, six hundred eighty-four thousand, nine hundred twenty-one".