5623921 has 4 divisors (see below), whose sum is σ = 5648292. Its totient is φ = 5599552.

The previous prime is 5623859. The next prime is 5623949. The reversal of 5623921 is 1293265.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2512225 + 3111696 = 1585^2 + 1764^2 .

It is a cyclic number.

It is not a de Polignac number, because 5623921 - 2¹¹ = 5621873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5623921.

It is not an unprimeable number, because it can be changed into a prime (5623951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11836 + ... + 12301.

It is an arithmetic number, because the mean of its divisors is an integer number (1412073).

Almost surely, 2^5623921 is an apocalyptic number.

It is an amenable number.

5623921 is a deficient number, since it is larger than the sum of its proper divisors (24371).

5623921 is a wasteful number, since it uses less digits than its factorization.

5623921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24370.

The product of its digits is 3240, while the sum is 28.

The square root of 5623921 is about 2371.4807610436. The cubic root of 5623921 is about 177.8332929777.

The spelling of 5623921 in words is "five million, six hundred twenty-three thousand, nine hundred twenty-one".