144905 has 8 divisors (see below), whose sum is σ = 176712. Its totient is φ = 114048.

The previous prime is 144899. The next prime is 144917. The reversal of 144905 is 509441.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 26569 + 118336 = 163^2 + 344^2 .

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 144905 - 2⁴ = 144889 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167 + ... + 563.

It is an arithmetic number, because the mean of its divisors is an integer number (22089).

2¹⁴⁴⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

144905 is a deficient number, since it is larger than the sum of its proper divisors (31807).

144905 is an equidigital number, since it uses as much as digits as its factorization.

144905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 144905 is about 380.6638937435. The cubic root of 144905 is about 52.5244028655.

The spelling of 144905 in words is "one hundred forty-four thousand, nine hundred five".