144440665 has 8 divisors (see below), whose sum is σ = 173446920. Its totient is φ = 115473792.

The previous prime is 144440651. The next prime is 144440693. The reversal of 144440665 is 566044441.

It can be written as a sum of positive squares in 4 ways, for example, as 22382361 + 122058304 = 4731^2 + 11048^2 .

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 144440665 - 2⁵ = 144440633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 144440665.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1060 + ... + 17029.

It is an arithmetic number, because the mean of its divisors is an integer number (21680865).

Almost surely, 2^144440665 is an apocalyptic number.

It is an amenable number.

144440665 is a deficient number, since it is larger than the sum of its proper divisors (29006255).

144440665 is a wasteful number, since it uses less digits than its factorization.

144440665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19691.

The product of its (nonzero) digits is 46080, while the sum is 34.

The square root of 144440665 is about 12018.3470161250. The cubic root of 144440665 is about 524.6823959584.

The spelling of 144440665 in words is "one hundred forty-four million, four hundred forty thousand, six hundred sixty-five".