8688421 has 4 divisors (see below), whose sum is σ = 9929632. Its totient is φ = 7447212.

The previous prime is 8688409. The next prime is 8688437. The reversal of 8688421 is 1248868.

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 8688421 - 2¹¹ = 8686373 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 (8688221) 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, 620595 + ... + 620608.

It is an arithmetic number, because the mean of its divisors is an integer number (2482408).

Almost surely, 2^8688421 is an apocalyptic number.

It is an amenable number.

8688421 is a deficient number, since it is larger than the sum of its proper divisors (1241211).

8688421 is a wasteful number, since it uses less digits than its factorization.

8688421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241210.

The product of its digits is 24576, while the sum is 37.

The square root of 8688421 is about 2947.6127628981. The cubic root of 8688421 is about 205.5797272552.

The spelling of 8688421 in words is "eight million, six hundred eighty-eight thousand, four hundred twenty-one".