144234821 has 4 divisors (see below), whose sum is σ = 144518700. Its totient is φ = 143950944.

The previous prime is 144234809. The next prime is 144234877. The reversal of 144234821 is 128432441.

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 123432100 + 20802721 = 11110^2 + 4561^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144234821 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 (144234221) 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, 141176 + ... + 142193.

It is an arithmetic number, because the mean of its divisors is an integer number (36129675).

Almost surely, 2^144234821 is an apocalyptic number.

It is an amenable number.

144234821 is a deficient number, since it is larger than the sum of its proper divisors (283879).

144234821 is an equidigital number, since it uses as much as digits as its factorization.

144234821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283878.

The product of its digits is 6144, while the sum is 29.

The square root of 144234821 is about 12009.7802228017. The cubic root of 144234821 is about 524.4330338898.

It can be divided in two parts, 1442 and 34821, that added together give a palindrome (36263).

The spelling of 144234821 in words is "one hundred forty-four million, two hundred thirty-four thousand, eight hundred twenty-one".