143309 has 4 divisors (see below), whose sum is σ = 144480. Its totient is φ = 142140.

The previous prime is 143291. The next prime is 143329. The reversal of 143309 is 903341.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 903341 = 233 ⋅3877.

It is a cyclic number.

It is not a de Polignac number, because 143309 - 2⁸ = 143053 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 11.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 143309.

It is not an unprimeable number, because it can be changed into a prime (143329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377 + ... + 654.

It is an arithmetic number, because the mean of its divisors is an integer number (36120).

2¹⁴³³⁰⁹ is an apocalyptic number.

It is an amenable number.

143309 is a deficient number, since it is larger than the sum of its proper divisors (1171).

143309 is a wasteful number, since it uses less digits than its factorization.

143309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 143309 is about 378.5617518979. The cubic root of 143309 is about 52.3308539627.

The spelling of 143309 in words is "one hundred forty-three thousand, three hundred nine".