143197993 has 4 divisors (see below), whose sum is σ = 144536400. Its totient is φ = 141859588.

The previous prime is 143197963. The next prime is 143198047. The reversal of 143197993 is 399791341.

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.

It is a cyclic number.

It is not a de Polignac number, because 143197993 - 2¹³ = 143189801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (143197903) 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, 669043 + ... + 669256.

It is an arithmetic number, because the mean of its divisors is an integer number (36134100).

Almost surely, 2^143197993 is an apocalyptic number.

It is an amenable number.

143197993 is a deficient number, since it is larger than the sum of its proper divisors (1338407).

143197993 is a wasteful number, since it uses less digits than its factorization.

143197993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338406.

The product of its digits is 183708, while the sum is 46.

The square root of 143197993 is about 11966.5363827634. The cubic root of 143197993 is about 523.1733866440.

The spelling of 143197993 in words is "one hundred forty-three million, one hundred ninety-seven thousand, nine hundred ninety-three".