8427321 has 40 divisors (see below), whose sum is σ = 14636160. Its totient is φ = 4732992.

The previous prime is 8427311. The next prime is 8427323. The reversal of 8427321 is 1237248.

It is not a de Polignac number, because 8427321 - 2¹⁹ = 7903033 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8427323) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 50380 + ... + 50546.

It is an arithmetic number, because the mean of its divisors is an integer number (365904).

Almost surely, 2^8427321 is an apocalyptic number.

8427321 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

8427321 is a deficient number, since it is larger than the sum of its proper divisors (6208839).

8427321 is a wasteful number, since it uses less digits than its factorization.

8427321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275 (or 266 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 8427321 is about 2902.9848432260. The cubic root of 8427321 is about 203.4994214658.

The spelling of 8427321 in words is "eight million, four hundred twenty-seven thousand, three hundred twenty-one".