4421520 has 160 divisors (see below), whose sum is σ = 16070400. Its totient is φ = 1115136.

The previous prime is 4421507. The next prime is 4421533. The reversal of 4421520 is 251244.

It is an interprime number because it is at equal distance from previous prime (4421507) and next prime (4421533).

It is a super-2 number, since 2×4421520² = 39099678220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 4421493 and 4421502.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 49636 + ... + 49724.

It is an arithmetic number, because the mean of its divisors is an integer number (100440).

Almost surely, 2^4421520 is an apocalyptic number.

4421520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4421520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8035200).

4421520 is an abundant number, since it is smaller than the sum of its proper divisors (11648880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4421520 is a wasteful number, since it uses less digits than its factorization.

4421520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 4421520 is about 2102.7410682250. The cubic root of 4421520 is about 164.1309681569.

Adding to 4421520 its reverse (251244), we get a palindrome (4672764).

The spelling of 4421520 in words is "four million, four hundred twenty-one thousand, five hundred twenty".