144985805 has 8 divisors (see below), whose sum is σ = 175579800. Its totient is φ = 114924096.

The previous prime is 144985801. The next prime is 144985817. The reversal of 144985805 is 508589441.

It can be written as a sum of positive squares in 4 ways, for example, as 55323844 + 89661961 = 7438^2 + 9469^2 .

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 144985805 - 2² = 144985801 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144985801) 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, 132470 + ... + 133559.

It is an arithmetic number, because the mean of its divisors is an integer number (21947475).

Almost surely, 2^144985805 is an apocalyptic number.

It is an amenable number.

144985805 is a deficient number, since it is larger than the sum of its proper divisors (30593995).

144985805 is a wasteful number, since it uses less digits than its factorization.

144985805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266143.

The product of its (nonzero) digits is 230400, while the sum is 44.

The square root of 144985805 is about 12041.0051490729. The cubic root of 144985805 is about 525.3416430853.

The spelling of 144985805 in words is "one hundred forty-four million, nine hundred eighty-five thousand, eight hundred five".