143999 has 2 divisors, whose sum is σ = 144000. Its totient is φ = 143998.

The previous prime is 143981. The next prime is 144013. The reversal of 143999 is 999341.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 143999 - 2⁸ = 143743 is a prime.

143999 is a modest number, since divided by 999 gives 143 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143909) 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, 71999 + 72000.

It is an arithmetic number, because the mean of its divisors is an integer number (72000).

2¹⁴³⁹⁹⁹ is an apocalyptic number.

143999 is a deficient number, since it is larger than the sum of its proper divisors (1).

143999 is an equidigital number, since it uses as much as digits as its factorization.

143999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 35.

The square root of 143999 is about 379.4720016022. The cubic root of 143999 is about 52.4147065533.

The spelling of 143999 in words is "one hundred forty-three thousand, nine hundred ninety-nine".