4421645 has 8 divisors (see below), whose sum is σ = 5435640. Its totient is φ = 3450880.

The previous prime is 4421633. The next prime is 4421653. The reversal of 4421645 is 5461244.

It can be written as a sum of positive squares in 4 ways, for example, as 316969 + 4104676 = 563^2 + 2026^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4421645 - 2¹⁶ = 4356109 is a prime.

It is a super-3 number, since 3×4421645³ (a number of 21 digits) contains 333 as substring.

It is a Curzon number.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10580 + ... + 10989.

It is an arithmetic number, because the mean of its divisors is an integer number (679455).

Almost surely, 2^4421645 is an apocalyptic number.

It is an amenable number.

4421645 is a deficient number, since it is larger than the sum of its proper divisors (1013995).

4421645 is a wasteful number, since it uses less digits than its factorization.

4421645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21615.

The product of its digits is 3840, while the sum is 26.

The square root of 4421645 is about 2102.7707911230. The cubic root of 4421645 is about 164.1325148481.

Adding to 4421645 its reverse (5461244), we get a palindrome (9882889).

The spelling of 4421645 in words is "four million, four hundred twenty-one thousand, six hundred forty-five".