4521240 has 96 divisors (see below), whose sum is σ = 15490800. Its totient is φ = 1140480.

The previous prime is 4521217. The next prime is 4521241. The reversal of 4521240 is 421254.

It is a super-2 number, since 2×4521240² = 40883222275200, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4521241) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 6510 + ... + 7170.

Almost surely, 2^4521240 is an apocalyptic number.

4521240 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 4521240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7745400).

4521240 is an abundant number, since it is smaller than the sum of its proper divisors (10969560).

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

4521240 is a wasteful number, since it uses less digits than its factorization.

4521240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697 (or 690 counting only the distinct ones).

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

The square root of 4521240 is about 2126.3207660181. The cubic root of 4521240 is about 165.3557064474.

Adding to 4521240 its reverse (421254), we get a palindrome (4942494).

It can be divided in two parts, 4521 and 240, that added together give a square (4761 = 69²).

The spelling of 4521240 in words is "four million, five hundred twenty-one thousand, two hundred forty".