144639421 has 2 divisors, whose sum is σ = 144639422. Its totient is φ = 144639420.

The previous prime is 144639413. The next prime is 144639437. The reversal of 144639421 is 124936441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129732100 + 14907321 = 11390^2 + 3861^2 .

It is a cyclic number.

It is not a de Polignac number, because 144639421 - 2³ = 144639413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144633421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72319710 + 72319711.

It is an arithmetic number, because the mean of its divisors is an integer number (72319711).

Almost surely, 2^144639421 is an apocalyptic number.

It is an amenable number.

144639421 is a deficient number, since it is larger than the sum of its proper divisors (1).

144639421 is an equidigital number, since it uses as much as digits as its factorization.

144639421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 34.

The square root of 144639421 is about 12026.6130311073. The cubic root of 144639421 is about 524.9229468171.

The spelling of 144639421 in words is "one hundred forty-four million, six hundred thirty-nine thousand, four hundred twenty-one".