143809 has 4 divisors (see below), whose sum is σ = 148480. Its totient is φ = 139140.

The previous prime is 143807. The next prime is 143813. The reversal of 143809 is 908341.

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: 908341 = 7 ⋅129763.

It is a cyclic number.

It is not a de Polignac number, because 143809 - 2¹ = 143807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (143807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2289 + ... + 2350.

It is an arithmetic number, because the mean of its divisors is an integer number (37120).

2¹⁴³⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

143809 is a deficient number, since it is larger than the sum of its proper divisors (4671).

143809 is an equidigital number, since it uses as much as digits as its factorization.

143809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4670.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 143809 is about 379.2215711164. The cubic root of 143809 is about 52.3916434822.

The spelling of 143809 in words is "one hundred forty-three thousand, eight hundred nine".