4251440 has 40 divisors (see below), whose sum is σ = 10408560. Its totient is φ = 1610496.

The previous prime is 4251419. The next prime is 4251449. The reversal of 4251440 is 441524.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (4251449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122 + ... + 2918.

It is an arithmetic number, because the mean of its divisors is an integer number (260214).

Almost surely, 2^4251440 is an apocalyptic number.

4251440 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 4251440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5204280).

4251440 is an abundant number, since it is smaller than the sum of its proper divisors (6157120).

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

4251440 is a wasteful number, since it uses less digits than its factorization.

4251440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2829 (or 2823 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 4251440 is about 2061.9020345303. The cubic root of 4251440 is about 161.9988822765.

Adding to 4251440 its reverse (441524), we get a palindrome (4692964).

The spelling of 4251440 in words is "four million, two hundred fifty-one thousand, four hundred forty".