144721865 has 8 divisors (see below), whose sum is σ = 181217088. Its totient is φ = 110743600.

The previous prime is 144721849. The next prime is 144721877. The reversal of 144721865 is 568127441.

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

It is not a de Polignac number, because 144721865 - 2⁴ = 144721849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 629111 + ... + 629340.

It is an arithmetic number, because the mean of its divisors is an integer number (22652136).

Almost surely, 2^144721865 is an apocalyptic number.

It is an amenable number.

144721865 is a deficient number, since it is larger than the sum of its proper divisors (36495223).

144721865 is a wasteful number, since it uses less digits than its factorization.

144721865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258479.

The product of its digits is 53760, while the sum is 38.

The square root of 144721865 is about 12030.0401079963. The cubic root of 144721865 is about 525.0226626649.

The spelling of 144721865 in words is "one hundred forty-four million, seven hundred twenty-one thousand, eight hundred sixty-five".