143987993 has 2 divisors, whose sum is σ = 143987994. Its totient is φ = 143987992.

The previous prime is 143987971. The next prime is 143988017. The reversal of 143987993 is 399789341.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138956944 + 5031049 = 11788^2 + 2243^2 .

It is a cyclic number.

It is not a de Polignac number, because 143987993 - 2¹⁴ = 143971609 is a prime.

It is not a weakly prime, because it can be changed into another prime (143987933) 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 as a sum of consecutive naturals, namely, 71993996 + 71993997.

It is an arithmetic number, because the mean of its divisors is an integer number (71993997).

Almost surely, 2^143987993 is an apocalyptic number.

It is an amenable number.

143987993 is a deficient number, since it is larger than the sum of its proper divisors (1).

143987993 is an equidigital number, since it uses as much as digits as its factorization.

143987993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 53.

The square root of 143987993 is about 11999.4996979041. The cubic root of 143987993 is about 524.1337102693.

The spelling of 143987993 in words is "one hundred forty-three million, nine hundred eighty-seven thousand, nine hundred ninety-three".