4043421 has 6 divisors (see below), whose sum is σ = 5840510. Its totient is φ = 2695608.

The previous prime is 4043411. The next prime is 4043437. The reversal of 4043421 is 1243404.

It can be written as a sum of positive squares in only one way, i.e., 3944196 + 99225 = 1986^2 + 315^2 .

It is not a de Polignac number, because 4043421 - 2⁶ = 4043357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4043394 and 4043403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4043401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 224626 + ... + 224643.

Almost surely, 2^4043421 is an apocalyptic number.

It is an amenable number.

4043421 is a deficient number, since it is larger than the sum of its proper divisors (1797089).

4043421 is a wasteful number, since it uses less digits than its factorization.

4043421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449275 (or 449272 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 4043421 is about 2010.8259497033. The cubic root of 4043421 is about 159.3124271086.

Adding to 4043421 its reverse (1243404), we get a palindrome (5286825).

The spelling of 4043421 in words is "four million, forty-three thousand, four hundred twenty-one".