144399021 has 16 divisors (see below), whose sum is σ = 207567360. Its totient is φ = 88764480.

The previous prime is 144399011. The next prime is 144399041. The reversal of 144399021 is 120993441.

It is not a de Polignac number, because 144399021 - 2⁶ = 144398957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144399011) 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, 54436 + ... + 57026.

It is an arithmetic number, because the mean of its divisors is an integer number (12972960).

Almost surely, 2^144399021 is an apocalyptic number.

It is an amenable number.

144399021 is a deficient number, since it is larger than the sum of its proper divisors (63168339).

144399021 is a wasteful number, since it uses less digits than its factorization.

144399021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4036.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 144399021 is about 12016.6143734415. The cubic root of 144399021 is about 524.6319670069.

The spelling of 144399021 in words is "one hundred forty-four million, three hundred ninety-nine thousand, twenty-one".