144428729 has 4 divisors (see below), whose sum is σ = 149409060. Its totient is φ = 139448400.

The previous prime is 144428699. The next prime is 144428737. The reversal of 144428729 is 927824441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 927824441 = 2083 ⋅445427.

It can be written as a sum of positive squares in 2 ways, for example, as 39980329 + 104448400 = 6323^2 + 10220^2 .

It is a cyclic number.

It is not a de Polignac number, because 144428729 - 2¹² = 144424633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144428749) 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, 2490122 + ... + 2490179.

It is an arithmetic number, because the mean of its divisors is an integer number (37352265).

Almost surely, 2^144428729 is an apocalyptic number.

It is an amenable number.

144428729 is a deficient number, since it is larger than the sum of its proper divisors (4980331).

144428729 is an equidigital number, since it uses as much as digits as its factorization.

144428729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4980330.

The product of its digits is 129024, while the sum is 41.

The square root of 144428729 is about 12017.8504317536. The cubic root of 144428729 is about 524.6679430074.

The spelling of 144428729 in words is "one hundred forty-four million, four hundred twenty-eight thousand, seven hundred twenty-nine".