144688381 has 4 divisors (see below), whose sum is σ = 145182492. Its totient is φ = 144194272.

The previous prime is 144688367. The next prime is 144688393. The reversal of 144688381 is 183886441.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 114811225 + 29877156 = 10715^2 + 5466^2 .

It is a cyclic number.

It is not a de Polignac number, because 144688381 - 2¹⁹ = 144164093 is a prime.

It is a super-2 number, since 2×144688381² = 41869455192802322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144688301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246616 + ... + 247201.

It is an arithmetic number, because the mean of its divisors is an integer number (36295623).

Almost surely, 2^144688381 is an apocalyptic number.

It is an amenable number.

144688381 is a deficient number, since it is larger than the sum of its proper divisors (494111).

144688381 is an equidigital number, since it uses as much as digits as its factorization.

144688381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494110.

The product of its digits is 147456, while the sum is 43.

The square root of 144688381 is about 12028.6483446811. The cubic root of 144688381 is about 524.9821684042.

The spelling of 144688381 in words is "one hundred forty-four million, six hundred eighty-eight thousand, three hundred eighty-one".