144403921 has 8 divisors (see below), whose sum is σ = 149347584. Its totient is φ = 139478160.

The previous prime is 144403907. The next prime is 144403937. The reversal of 144403921 is 129304441.

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 144403921 - 2¹⁹ = 143879633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 144403921.

It is not an unprimeable number, because it can be changed into a prime (144403991) 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, 13086 + ... + 21448.

It is an arithmetic number, because the mean of its divisors is an integer number (18668448).

Almost surely, 2^144403921 is an apocalyptic number.

It is an amenable number.

144403921 is a deficient number, since it is larger than the sum of its proper divisors (4943663).

144403921 is an equidigital number, since it uses as much as digits as its factorization.

144403921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8951.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 144403921 is about 12016.8182560942. The cubic root of 144403921 is about 524.6379011827.

The spelling of 144403921 in words is "one hundred forty-four million, four hundred three thousand, nine hundred twenty-one".