144394921 has 4 divisors (see below), whose sum is σ = 157521744. Its totient is φ = 131268100.

The previous prime is 144394919. The next prime is 144394933. The reversal of 144394921 is 129493441.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 144394921 - 2¹ = 144394919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144394321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6563395 + ... + 6563416.

It is an arithmetic number, because the mean of its divisors is an integer number (39380436).

Almost surely, 2^144394921 is an apocalyptic number.

144394921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

144394921 is a deficient number, since it is larger than the sum of its proper divisors (13126823).

144394921 is a wasteful number, since it uses less digits than its factorization.

144394921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13126822.

The product of its digits is 31104, while the sum is 37.

The square root of 144394921 is about 12016.4437750942. The cubic root of 144394921 is about 524.6270015729.

The spelling of 144394921 in words is "one hundred forty-four million, three hundred ninety-four thousand, nine hundred twenty-one".