8420231 has 4 divisors (see below), whose sum is σ = 8786352. Its totient is φ = 8054112.

The previous prime is 8420221. The next prime is 8420233. The reversal of 8420231 is 1320248.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8420231 - 2¹⁰ = 8419207 is a prime.

It is a super-3 number, since 3×8420231³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183026 + ... + 183071.

It is an arithmetic number, because the mean of its divisors is an integer number (2196588).

Almost surely, 2^8420231 is an apocalyptic number.

8420231 is a deficient number, since it is larger than the sum of its proper divisors (366121).

8420231 is a wasteful number, since it uses less digits than its factorization.

8420231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366120.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 8420231 is about 2901.7634293650. The cubic root of 8420231 is about 203.4423366696.

Adding to 8420231 its reverse (1320248), we get a palindrome (9740479).

The spelling of 8420231 in words is "eight million, four hundred twenty thousand, two hundred thirty-one".