144644021 has 8 divisors (see below), whose sum is σ = 145742688. Its totient is φ = 143550000.

The previous prime is 144644011. The next prime is 144644029. The reversal of 144644021 is 120446441.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 144644021 - 2²² = 140449717 is a prime.

It is a super-2 number, since 2×144644021² = 41843785622096882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144644029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82211 + ... + 83951.

It is an arithmetic number, because the mean of its divisors is an integer number (18217836).

Almost surely, 2^144644021 is an apocalyptic number.

It is an amenable number.

144644021 is a deficient number, since it is larger than the sum of its proper divisors (1098667).

144644021 is a wasteful number, since it uses less digits than its factorization.

144644021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 144644021 is about 12026.8042721248. The cubic root of 144644021 is about 524.9285115056.

The spelling of 144644021 in words is "one hundred forty-four million, six hundred forty-four thousand, twenty-one".