144702721 has 8 divisors (see below), whose sum is σ = 149826600. Its totient is φ = 139587840.

The previous prime is 144702713. The next prime is 144702737. The reversal of 144702721 is 127207441.

It can be written as a sum of positive squares in 4 ways, for example, as 53290000 + 91412721 = 7300^2 + 9561^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 144702721 - 2³ = 144702713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 144702721.

It is not an unprimeable number, because it can be changed into a prime (144702791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61515 + ... + 63823.

It is an arithmetic number, because the mean of its divisors is an integer number (18728325).

Almost surely, 2^144702721 is an apocalyptic number.

It is an amenable number.

144702721 is a deficient number, since it is larger than the sum of its proper divisors (5123879).

144702721 is a wasteful number, since it uses less digits than its factorization.

144702721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4499.

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 144702721 is about 12029.2444068611. The cubic root of 144702721 is about 524.9995114130. Note that the first 3 decimals are identical.

The spelling of 144702721 in words is "one hundred forty-four million, seven hundred two thousand, seven hundred twenty-one".