144340421 has 4 divisors (see below), whose sum is σ = 152831052. Its totient is φ = 135849792.

The previous prime is 144340411. The next prime is 144340429. The reversal of 144340421 is 124043441.

It is a happy number.

144340421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124043441 = 17 ⋅7296673.

It can be written as a sum of positive squares in 2 ways, for example, as 111724900 + 32615521 = 10570^2 + 5711^2 .

It is a cyclic number.

It is not a de Polignac number, because 144340421 - 2²² = 140146117 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 (144340429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4245290 + ... + 4245323.

It is an arithmetic number, because the mean of its divisors is an integer number (38207763).

Almost surely, 2^144340421 is an apocalyptic number.

It is an amenable number.

144340421 is a deficient number, since it is larger than the sum of its proper divisors (8490631).

144340421 is an equidigital number, since it uses as much as digits as its factorization.

144340421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8490630.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 144340421 is about 12014.1758352373. The cubic root of 144340421 is about 524.5609887025.

Adding to 144340421 its reverse (124043441), we get a palindrome (268383862).

The spelling of 144340421 in words is "one hundred forty-four million, three hundred forty thousand, four hundred twenty-one".