144404381 has 4 divisors (see below), whose sum is σ = 157532064. Its totient is φ = 131276700.

The previous prime is 144404371. The next prime is 144404387. The reversal of 144404381 is 183404441.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 183404441 = 11 ⋅16673131.

It is a cyclic number.

It is not a de Polignac number, because 144404381 - 2⁶ = 144404317 is a prime.

It is a super-2 number, since 2×144404381² = 41705250503986322, which contains 22 as substring.

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 (144404387) 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, 6563825 + ... + 6563846.

It is an arithmetic number, because the mean of its divisors is an integer number (39383016).

Almost surely, 2^144404381 is an apocalyptic number.

144404381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

144404381 is a deficient number, since it is larger than the sum of its proper divisors (13127683).

144404381 is a wasteful number, since it uses less digits than its factorization.

144404381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13127682.

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 144404381 is about 12016.8373959208. The cubic root of 144404381 is about 524.6384582617.

The spelling of 144404381 in words is "one hundred forty-four million, four hundred four thousand, three hundred eighty-one".