144421257 has 8 divisors (see below), whose sum is σ = 193065984. Its totient is φ = 96028688.

The previous prime is 144421253. The next prime is 144421283. The reversal of 144421257 is 752124441.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 144421257 - 2² = 144421253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (144421253) 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 7 ways as a sum of consecutive naturals, for example, 61698 + ... + 63995.

It is an arithmetic number, because the mean of its divisors is an integer number (24133248).

Almost surely, 2^144421257 is an apocalyptic number.

It is an amenable number.

144421257 is a deficient number, since it is larger than the sum of its proper divisors (48644727).

144421257 is a wasteful number, since it uses less digits than its factorization.

144421257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126079.

The product of its digits is 8960, while the sum is 30.

The square root of 144421257 is about 12017.5395568311. The cubic root of 144421257 is about 524.6588949772.

Adding to 144421257 its reverse (752124441), we get a palindrome (896545698).

The spelling of 144421257 in words is "one hundred forty-four million, four hundred twenty-one thousand, two hundred fifty-seven".