4418821 has 4 divisors (see below), whose sum is σ = 4820544. Its totient is φ = 4017100.

The previous prime is 4418819. The next prime is 4418831. The reversal of 4418821 is 1288144.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4418821 - 2¹ = 4418819 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 4418821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4418801) 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, 200845 + ... + 200866.

It is an arithmetic number, because the mean of its divisors is an integer number (1205136).

Almost surely, 2^4418821 is an apocalyptic number.

It is an amenable number.

4418821 is a deficient number, since it is larger than the sum of its proper divisors (401723).

4418821 is a wasteful number, since it uses less digits than its factorization.

4418821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401722.

The product of its digits is 2048, while the sum is 28.

The square root of 4418821 is about 2102.0991889062. The cubic root of 4418821 is about 164.0975648891.

The spelling of 4418821 in words is "four million, four hundred eighteen thousand, eight hundred twenty-one".