4521840 has 80 divisors (see below), whose sum is σ = 14249088. Its totient is φ = 1186048.

The previous prime is 4521833. The next prime is 4521841. The reversal of 4521840 is 481254.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 4521840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4521841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19807 + ... + 20033.

Almost surely, 2^4521840 is an apocalyptic number.

4521840 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 4521840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7124544).

4521840 is an abundant number, since it is smaller than the sum of its proper divisors (9727248).

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

4521840 is a wasteful number, since it uses less digits than its factorization.

4521840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 4521840 is about 2126.4618501163. The cubic root of 4521840 is about 165.3630207414.

The spelling of 4521840 in words is "four million, five hundred twenty-one thousand, eight hundred forty".