4321440 has 72 divisors (see below), whose sum is σ = 14751828. Its totient is φ = 1152000.

The previous prime is 4321439. The next prime is 4321481. The reversal of 4321440 is 441234.

It can be written as a sum of positive squares in 2 ways, for example, as 4309776 + 11664 = 2076^2 + 108^2 .

It is a tau number, because it is divible by the number of its divisors (72).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61 + ... + 2940.

Almost surely, 2^4321440 is an apocalyptic number.

4321440 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 4321440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7375914).

4321440 is an abundant number, since it is smaller than the sum of its proper divisors (10430388).

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

4321440 is a wasteful number, since it uses less digits than its factorization.

4321440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3022 (or 3011 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 4321440 is about 2078.8073503815. The cubic root of 4321440 is about 162.8831511028.

Adding to 4321440 its reverse (441234), we get a palindrome (4762674).

It can be divided in two parts, 4321 and 440, that added together give a square (4761 = 69²).

The spelling of 4321440 in words is "four million, three hundred twenty-one thousand, four hundred forty".