8389421 has 4 divisors (see below), whose sum is σ = 8401344. Its totient is φ = 8377500.

The previous prime is 8389373. The next prime is 8389441. The reversal of 8389421 is 1249838.

It is a happy number.

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 8389421 - 2²² = 4195117 is a prime.

It is a d-powerful number, because it can be written as 8 + 3³ + 8³ + 9 + 4⁴ + 2²³ + 1 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8389441) 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 3 ways as a sum of consecutive naturals, for example, 4835 + ... + 6336.

It is an arithmetic number, because the mean of its divisors is an integer number (2100336).

Almost surely, 2^8389421 is an apocalyptic number.

It is an amenable number.

8389421 is a deficient number, since it is larger than the sum of its proper divisors (11923).

8389421 is a wasteful number, since it uses less digits than its factorization.

8389421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11922.

The product of its digits is 13824, while the sum is 35.

The square root of 8389421 is about 2896.4497233682. The cubic root of 8389421 is about 203.1938985525.

The spelling of 8389421 in words is "eight million, three hundred eighty-nine thousand, four hundred twenty-one".