4450421 has 4 divisors (see below), whose sum is σ = 4458252. Its totient is φ = 4442592.

The previous prime is 4450409. The next prime is 4450441. The reversal of 4450421 is 1240544.

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 1661521 + 2788900 = 1289^2 + 1670^2 .

It is a cyclic number.

It is not a de Polignac number, because 4450421 - 2¹⁰ = 4449397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4450393 and 4450402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4450441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2990 + ... + 4223.

It is an arithmetic number, because the mean of its divisors is an integer number (1114563).

Almost surely, 2^4450421 is an apocalyptic number.

It is an amenable number.

4450421 is a deficient number, since it is larger than the sum of its proper divisors (7831).

4450421 is an equidigital number, since it uses as much as digits as its factorization.

4450421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7830.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 4450421 is about 2109.6020951829. The cubic root of 4450421 is about 164.4878025465.

Adding to 4450421 its reverse (1240544), we get a palindrome (5690965).

The spelling of 4450421 in words is "four million, four hundred fifty thousand, four hundred twenty-one".