144220424 has 8 divisors (see below), whose sum is σ = 270413310. Its totient is φ = 72110208.

The previous prime is 144220403. The next prime is 144220429. The reversal of 144220424 is 424022441.

It can be written as a sum of positive squares in only one way, i.e., 133864900 + 10355524 = 11570^2 + 3218^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 144220424.

It is not an unprimeable number, because it can be changed into a prime (144220429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9013769 + ... + 9013784.

Almost surely, 2^144220424 is an apocalyptic number.

It is an amenable number.

144220424 is a deficient number, since it is larger than the sum of its proper divisors (126192886).

144220424 is a wasteful number, since it uses less digits than its factorization.

144220424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18027559 (or 18027555 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 23.

The square root of 144220424 is about 12009.1808213550. The cubic root of 144220424 is about 524.4155843041.

Adding to 144220424 its reverse (424022441), we get a palindrome (568242865).

The spelling of 144220424 in words is "one hundred forty-four million, two hundred twenty thousand, four hundred twenty-four".