143539985 has 4 divisors (see below), whose sum is σ = 172247988. Its totient is φ = 114831984.

The previous prime is 143539961. The next prime is 143539997. The reversal of 143539985 is 589935341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 589935341 = 1289 ⋅457669.

It can be written as a sum of positive squares in 2 ways, for example, as 57866449 + 85673536 = 7607^2 + 9256^2 .

It is a cyclic number.

It is not a de Polignac number, because 143539985 - 2²⁰ = 142491409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14353994 + ... + 14354003.

It is an arithmetic number, because the mean of its divisors is an integer number (43061997).

Almost surely, 2^143539985 is an apocalyptic number.

It is an amenable number.

143539985 is a deficient number, since it is larger than the sum of its proper divisors (28708003).

143539985 is an equidigital number, since it uses as much as digits as its factorization.

143539985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28708002.

The product of its digits is 583200, while the sum is 47.

The square root of 143539985 is about 11980.8173761225. The cubic root of 143539985 is about 523.5895443986.

The spelling of 143539985 in words is "one hundred forty-three million, five hundred thirty-nine thousand, nine hundred eighty-five".