5623421 has 2 divisors, whose sum is σ = 5623422. Its totient is φ = 5623420.

The previous prime is 5623403. The next prime is 5623451. The reversal of 5623421 is 1243265.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5359225 + 264196 = 2315^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 5623421 - 2²² = 1429117 is a prime.

It is a d-powerful number, because it can be written as 5⁹ + 6² + 2¹⁹ + 3⁵ + 4¹⁰ + 2²¹ + 1 .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5623451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2811710 + 2811711.

It is an arithmetic number, because the mean of its divisors is an integer number (2811711).

Almost surely, 2^5623421 is an apocalyptic number.

It is an amenable number.

5623421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5623421 is an equidigital number, since it uses as much as digits as its factorization.

5623421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 23.

The square root of 5623421 is about 2371.3753393337. The cubic root of 5623421 is about 177.8280226760.

Adding to 5623421 its reverse (1243265), we get a palindrome (6866686).

The spelling of 5623421 in words is "five million, six hundred twenty-three thousand, four hundred twenty-one".