144243309 has 24 divisors (see below), whose sum is σ = 224373888. Its totient is φ = 82185600.

The previous prime is 144243301. The next prime is 144243311. The reversal of 144243309 is 903342441.

It is not a de Polignac number, because 144243309 - 2³ = 144243301 is a prime.

It is a super-2 number, since 2×144243309² = 41612264382538962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144243301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57724 + ... + 60170.

It is an arithmetic number, because the mean of its divisors is an integer number (9348912).

Almost surely, 2^144243309 is an apocalyptic number.

It is an amenable number.

144243309 is a deficient number, since it is larger than the sum of its proper divisors (80130579).

144243309 is a wasteful number, since it uses less digits than its factorization.

144243309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2865 (or 2858 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 144243309 is about 12010.1335962595. The cubic root of 144243309 is about 524.4433210503.

The spelling of 144243309 in words is "one hundred forty-four million, two hundred forty-three thousand, three hundred nine".