144904221 has 60 divisors (see below), whose sum is σ = 274776480. Its totient is φ = 75252240.

The previous prime is 144904181. The next prime is 144904231. The reversal of 144904221 is 122409441.

It is a happy number.

It is not a de Polignac number, because 144904221 - 2¹⁴ = 144887837 is a prime.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144904231) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 42000 + ... + 45318.

It is an arithmetic number, because the mean of its divisors is an integer number (4579608).

Almost surely, 2^144904221 is an apocalyptic number.

144904221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

144904221 is a deficient number, since it is larger than the sum of its proper divisors (129872259).

144904221 is a wasteful number, since it uses less digits than its factorization.

144904221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3356 (or 3340 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 144904221 is about 12037.6169153201. The cubic root of 144904221 is about 525.2430874274.

The spelling of 144904221 in words is "one hundred forty-four million, nine hundred four thousand, two hundred twenty-one".