144442405 has 4 divisors (see below), whose sum is σ = 173330892. Its totient is φ = 115553920.

The previous prime is 144442393. The next prime is 144442429. The reversal of 144442405 is 504244441.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19695844 + 124746561 = 4438^2 + 11169^2 .

It is a de Polignac number, because none of the positive numbers 2^k-144442405 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14444236 + ... + 14444245.

It is an arithmetic number, because the mean of its divisors is an integer number (43332723).

Almost surely, 2^144442405 is an apocalyptic number.

It is an amenable number.

144442405 is a deficient number, since it is larger than the sum of its proper divisors (28888487).

144442405 is an equidigital number, since it uses as much as digits as its factorization.

144442405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28888486.

The product of its (nonzero) digits is 10240, while the sum is 28.

The square root of 144442405 is about 12018.4194052296. The cubic root of 144442405 is about 524.6845028067.

Adding to 144442405 its reverse (504244441), we get a palindrome (648686846).

The spelling of 144442405 in words is "one hundred forty-four million, four hundred forty-two thousand, four hundred five".