8421243 has 24 divisors (see below), whose sum is σ = 12201984. Its totient is φ = 5155920.

The previous prime is 8421241. The next prime is 8421251. The reversal of 8421243 is 3421248.

It is not a de Polignac number, because 8421243 - 2¹ = 8421241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8421241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66246 + ... + 66372.

It is an arithmetic number, because the mean of its divisors is an integer number (508416).

Almost surely, 2^8421243 is an apocalyptic number.

8421243 is a deficient number, since it is larger than the sum of its proper divisors (3780741).

8421243 is a wasteful number, since it uses less digits than its factorization.

8421243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215 (or 184 counting only the distinct ones).

The product of its digits is 1536, while the sum is 24.

The square root of 8421243 is about 2901.9378008496. The cubic root of 8421243 is about 203.4504866993.

It can be divided in two parts, 84212 and 43, that added together give a triangular number (84255 = T₄₁₀).

The spelling of 8421243 in words is "eight million, four hundred twenty-one thousand, two hundred forty-three".