144640013 has 8 divisors (see below), whose sum is σ = 168676800. Its totient is φ = 123976860.

The previous prime is 144639997. The next prime is 144640019. The reversal of 144640013 is 310046441.

It is not a de Polignac number, because 144640013 - 2⁴ = 144639997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144640019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210503 + ... + 211188.

It is an arithmetic number, because the mean of its divisors is an integer number (21084600).

Almost surely, 2^144640013 is an apocalyptic number.

It is an amenable number.

144640013 is a deficient number, since it is larger than the sum of its proper divisors (24036787).

144640013 is an frugal number, since it uses more digits than its factorization.

144640013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421712 (or 421698 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 144640013 is about 12026.6376431653. The cubic root of 144640013 is about 524.9236629749.

Adding to 144640013 its reverse (310046441), we get a palindrome (454686454).

The spelling of 144640013 in words is "one hundred forty-four million, six hundred forty thousand, thirteen".