144203813 has 18 divisors (see below), whose sum is σ = 163335186. Its totient is φ = 127244832.

The previous prime is 144203797. The next prime is 144203821. The reversal of 144203813 is 318302441.

It can be written as a sum of positive squares in 3 ways, for example, as 611524 + 143592289 = 782^2 + 11983^2 .

It is not a de Polignac number, because 144203813 - 2⁴ = 144203797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144203833) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 88595 + ... + 90207.

It is an arithmetic number, because the mean of its divisors is an integer number (9074177).

Almost surely, 2^144203813 is an apocalyptic number.

144203813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

144203813 is a deficient number, since it is larger than the sum of its proper divisors (19131373).

144203813 is a wasteful number, since it uses less digits than its factorization.

144203813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1685 (or 1649 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 144203813 is about 12008.4892055579. The cubic root of 144203813 is about 524.3954498425.

The spelling of 144203813 in words is "one hundred forty-four million, two hundred three thousand, eight hundred thirteen".