144229721 has 4 divisors (see below), whose sum is σ = 144278244. Its totient is φ = 144181200.

The previous prime is 144229693. The next prime is 144229733. The reversal of 144229721 is 127922441.

It is a happy number.

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 4044121 + 140185600 = 2011^2 + 11840^2 .

It is a cyclic number.

It is not a de Polignac number, because 144229721 - 2¹⁴ = 144213337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144229121) 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, 19490 + ... + 25851.

It is an arithmetic number, because the mean of its divisors is an integer number (36069561).

Almost surely, 2^144229721 is an apocalyptic number.

It is an amenable number.

144229721 is a deficient number, since it is larger than the sum of its proper divisors (48523).

144229721 is an equidigital number, since it uses as much as digits as its factorization.

144229721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48522.

The product of its digits is 8064, while the sum is 32.

The square root of 144229721 is about 12009.5678939752. The cubic root of 144229721 is about 524.4268526732.

The spelling of 144229721 in words is "one hundred forty-four million, two hundred twenty-nine thousand, seven hundred twenty-one".