144434421 has 20 divisors (see below), whose sum is σ = 221596012. Its totient is φ = 93685248.

The previous prime is 144434387. The next prime is 144434429. The reversal of 144434421 is 124434441.

It can be written as a sum of positive squares in 2 ways, for example, as 119574225 + 24860196 = 10935^2 + 4986^2 .

It is not a de Polignac number, because 144434421 - 2¹⁷ = 144303349 is a prime.

It is a super-2 number, since 2×144434421² = 41722603939210482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144434429) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21100 + ... + 27093.

Almost surely, 2^144434421 is an apocalyptic number.

It is an amenable number.

144434421 is a deficient number, since it is larger than the sum of its proper divisors (77161591).

144434421 is an equidigital number, since it uses as much as digits as its factorization.

144434421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48242 (or 48233 counting only the distinct ones).

The product of its digits is 6144, while the sum is 27.

The square root of 144434421 is about 12018.0872438171. The cubic root of 144434421 is about 524.6748353819.

Adding to 144434421 its reverse (124434441), we get a palindrome (268868862).

The spelling of 144434421 in words is "one hundred forty-four million, four hundred thirty-four thousand, four hundred twenty-one".