8943421 has 4 divisors (see below), whose sum is σ = 8967772. Its totient is φ = 8919072.

The previous prime is 8943419. The next prime is 8943437. The reversal of 8943421 is 1243498.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1243498 = 2 ⋅621749.

It can be written as a sum of positive squares in 2 ways, for example, as 4368100 + 4575321 = 2090^2 + 2139^2 .

It is a cyclic number.

It is not a de Polignac number, because 8943421 - 2¹ = 8943419 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 (8943401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11616 + ... + 12361.

It is an arithmetic number, because the mean of its divisors is an integer number (2241943).

Almost surely, 2^8943421 is an apocalyptic number.

It is an amenable number.

8943421 is a deficient number, since it is larger than the sum of its proper divisors (24351).

8943421 is a wasteful number, since it uses less digits than its factorization.

8943421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24350.

The product of its digits is 6912, while the sum is 31.

The square root of 8943421 is about 2990.5552996057. Note that the first 3 decimals coincide. The cubic root of 8943421 is about 207.5715802786.

The spelling of 8943421 in words is "eight million, nine hundred forty-three thousand, four hundred twenty-one".