144459721 has 8 divisors (see below), whose sum is σ = 170422784. Its totient is φ = 119828160.

The previous prime is 144459709. The next prime is 144459739. The reversal of 144459721 is 127954441.

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 144459721 - 2¹¹ = 144457673 is a prime.

It is a super-2 number, since 2×144459721² = 41737221982795682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (144459751) 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, 332640 + ... + 333073.

It is an arithmetic number, because the mean of its divisors is an integer number (21302848).

Almost surely, 2^144459721 is an apocalyptic number.

It is an amenable number.

144459721 is a deficient number, since it is larger than the sum of its proper divisors (25963063).

144459721 is an equidigital number, since it uses as much as digits as its factorization.

144459721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665751.

The product of its digits is 40320, while the sum is 37.

The square root of 144459721 is about 12019.1397778710. The cubic root of 144459721 is about 524.7054686577.

The spelling of 144459721 in words is "one hundred forty-four million, four hundred fifty-nine thousand, seven hundred twenty-one".