143243993 has 4 divisors (see below), whose sum is σ = 143328948. Its totient is φ = 143159040.

The previous prime is 143243959. The next prime is 143243999. The reversal of 143243993 is 399342341.

It is a happy number.

143243993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 399342341 = 31 ⋅12882011.

It can be written as a sum of positive squares in 2 ways, for example, as 128436889 + 14807104 = 11333^2 + 3848^2 .

It is a cyclic number.

It is not a de Polignac number, because 143243993 - 2¹² = 143239897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (143243999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39896 + ... + 43337.

It is an arithmetic number, because the mean of its divisors is an integer number (35832237).

Almost surely, 2^143243993 is an apocalyptic number.

It is an amenable number.

143243993 is a deficient number, since it is larger than the sum of its proper divisors (84955).

143243993 is an equidigital number, since it uses as much as digits as its factorization.

143243993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84954.

The product of its digits is 69984, while the sum is 38.

The square root of 143243993 is about 11968.4582549299. The cubic root of 143243993 is about 523.2294009284.

The spelling of 143243993 in words is "one hundred forty-three million, two hundred forty-three thousand, nine hundred ninety-three".