144391221 has 16 divisors (see below), whose sum is σ = 230368320. Its totient is φ = 88855920.

The previous prime is 144391207. The next prime is 144391243. The reversal of 144391221 is 122193441.

It is a happy number.

144391221 is a `hidden beast` number, since 1 + 4 + 439 + 1 + 221 = 666.

144391221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 144391221 - 2⁵ = 144391189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144391201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205335 + ... + 206036.

It is an arithmetic number, because the mean of its divisors is an integer number (14398020).

Almost surely, 2^144391221 is an apocalyptic number.

It is an amenable number.

144391221 is a deficient number, since it is larger than the sum of its proper divisors (85977099).

144391221 is a wasteful number, since it uses less digits than its factorization.

144391221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411393 (or 411387 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 144391221 is about 12016.2898184090. The cubic root of 144391221 is about 524.6225204908.

The spelling of 144391221 in words is "one hundred forty-four million, three hundred ninety-one thousand, two hundred twenty-one".