144421540 has 12 divisors (see below), whose sum is σ = 303285276. Its totient is φ = 57768608.

The previous prime is 144421523. The next prime is 144421547. The reversal of 144421540 is 45124441.

It can be written as a sum of positive squares in 2 ways, for example, as 60808804 + 83612736 = 7798^2 + 9144^2 .

It is not an unprimeable number, because it can be changed into a prime (144421547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3610519 + ... + 3610558.

It is an arithmetic number, because the mean of its divisors is an integer number (25273773).

Almost surely, 2^144421540 is an apocalyptic number.

144421540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

144421540 is an abundant number, since it is smaller than the sum of its proper divisors (158863736).

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

144421540 is a wasteful number, since it uses less digits than its factorization.

144421540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7221086 (or 7221084 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 144421540 is about 12017.5513312821. The cubic root of 144421540 is about 524.6592376746.

Adding to 144421540 its reverse (45124441), we get a palindrome (189545981).

The spelling of 144421540 in words is "one hundred forty-four million, four hundred twenty-one thousand, five hundred forty".