14221440 has 128 divisors (see below), whose sum is σ = 50428800. Its totient is φ = 3787776.

The previous prime is 14221421. The next prime is 14221483. The reversal of 14221440 is 4412241.

14221440 is a `hidden beast` number, since 1 + 4 + 221 + 440 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

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 15 ways as a sum of consecutive naturals, for example, 16869 + ... + 17691.

It is an arithmetic number, because the mean of its divisors is an integer number (393975).

Almost surely, 2^14221440 is an apocalyptic number.

14221440 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 14221440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25214400).

14221440 is an abundant number, since it is smaller than the sum of its proper divisors (36207360).

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

14221440 is an equidigital number, since it uses as much as digits as its factorization.

14221440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851 (or 833 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 14221440 is about 3771.1324559076. The cubic root of 14221440 is about 242.2783037792.

Adding to 14221440 its reverse (4412241), we get a palindrome (18633681).

The spelling of 14221440 in words is "fourteen million, two hundred twenty-one thousand, four hundred forty".