144001440 has 144 divisors (see below), whose sum is σ = 536137056. Its totient is φ = 34905600.

The previous prime is 144001433. The next prime is 144001463. The reversal of 144001440 is 44100441.

It is a tau number, because it is divible by the number of its divisors (144).

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 23 ways as a sum of consecutive naturals, for example, 11295 + ... + 20385.

It is an arithmetic number, because the mean of its divisors is an integer number (3723174).

Almost surely, 2^144001440 is an apocalyptic number.

144001440 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 144001440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268068528).

144001440 is an abundant number, since it is smaller than the sum of its proper divisors (392135616).

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

144001440 is a wasteful number, since it uses less digits than its factorization.

144001440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9123 (or 9112 counting only the distinct ones).

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

The square root of 144001440 is about 12000.0599998500. The cubic root of 144001440 is about 524.1500259969.

Adding to 144001440 its reverse (44100441), we get a palindrome (188101881).

Subtracting from 144001440 its reverse (44100441), we obtain a palindrome (99900999).

It can be divided in two parts, 144001 and 440, that added together give a palindrome (144441).

The spelling of 144001440 in words is "one hundred forty-four million, one thousand, four hundred forty".