168240143 has 4 divisors (see below), whose sum is σ = 178136640. Its totient is φ = 158343648.

The previous prime is 168240139. The next prime is 168240157. The reversal of 168240143 is 341042861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 168240143 - 2² = 168240139 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168240103) 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 in 3 ways as a sum of consecutive naturals, for example, 4948223 + ... + 4948256.

It is an arithmetic number, because the mean of its divisors is an integer number (44534160).

Almost surely, 2^168240143 is an apocalyptic number.

168240143 is a deficient number, since it is larger than the sum of its proper divisors (9896497).

168240143 is an equidigital number, since it uses as much as digits as its factorization.

168240143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9896496.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 168240143 is about 12970.7418060803. The cubic root of 168240143 is about 552.0476213466.

The spelling of 168240143 in words is "one hundred sixty-eight million, two hundred forty thousand, one hundred forty-three".