1440320 has 56 divisors (see below), whose sum is σ = 3925824. Its totient is φ = 493056.

The previous prime is 1440317. The next prime is 1440349. The reversal of 1440320 is 230441.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 1440295 and 1440304.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1919 + ... + 2561.

It is an arithmetic number, because the mean of its divisors is an integer number (70104).

2^1440320 is an apocalyptic number.

1440320 is a gapful number since it is divisible by the number (10) 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 1440320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1962912).

1440320 is an abundant number, since it is smaller than the sum of its proper divisors (2485504).

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

1440320 is an equidigital number, since it uses as much as digits as its factorization.

1440320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 1440320 is about 1200.1333259267. The cubic root of 1440320 is about 112.9326876109.

Adding to 1440320 its reverse (230441), we get a palindrome (1670761).

The spelling of 1440320 in words is "one million, four hundred forty thousand, three hundred twenty".