4043621 has 2 divisors, whose sum is σ = 4043622. Its totient is φ = 4043620.

The previous prime is 4043597. The next prime is 4043623. The reversal of 4043621 is 1263404.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3960100 + 83521 = 1990^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 4043621 - 2¹⁴ = 4027237 is a prime.

Together with 4043623, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 4043593 and 4043602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4043623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2021810 + 2021811.

It is an arithmetic number, because the mean of its divisors is an integer number (2021811).

Almost surely, 2^4043621 is an apocalyptic number.

It is an amenable number.

4043621 is a deficient number, since it is larger than the sum of its proper divisors (1).

4043621 is an equidigital number, since it uses as much as digits as its factorization.

4043621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 4043621 is about 2010.8756798967. The cubic root of 4043621 is about 159.3150537590.

It can be divided in two parts, 4043 and 621, that added together give a palindrome (4664).

The spelling of 4043621 in words is "four million, forty-three thousand, six hundred twenty-one".