144919865 has 8 divisors (see below), whose sum is σ = 174107400. Its totient is φ = 115800192.

The previous prime is 144919829. The next prime is 144919889. The reversal of 144919865 is 568919441.

It can be written as a sum of positive squares in 4 ways, for example, as 3024121 + 141895744 = 1739^2 + 11912^2 .

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 144919865 - 2⁸ = 144919609 is a prime.

It is an unprimeable number.

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, 12140 + ... + 20909.

It is an arithmetic number, because the mean of its divisors is an integer number (21763425).

Almost surely, 2^144919865 is an apocalyptic number.

It is an amenable number.

144919865 is a deficient number, since it is larger than the sum of its proper divisors (29187535).

144919865 is an equidigital number, since it uses as much as digits as its factorization.

144919865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33931.

The product of its digits is 311040, while the sum is 47.

The square root of 144919865 is about 12038.2666941715. The cubic root of 144919865 is about 525.2619886646.

The spelling of 144919865 in words is "one hundred forty-four million, nine hundred nineteen thousand, eight hundred sixty-five".