16440143 has 4 divisors (see below), whose sum is σ = 16591080. Its totient is φ = 16289208.

The previous prime is 16440133. The next prime is 16440161. The reversal of 16440143 is 34104461.

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 16440143 - 2⁶ = 16440079 is a prime.

It is a super-3 number, since 3×16440143³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16440103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75305 + ... + 75522.

It is an arithmetic number, because the mean of its divisors is an integer number (4147770).

Almost surely, 2^16440143 is an apocalyptic number.

16440143 is a deficient number, since it is larger than the sum of its proper divisors (150937).

16440143 is a wasteful number, since it uses less digits than its factorization.

16440143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150936.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 16440143 is about 4054.6446206789. The cubic root of 16440143 is about 254.2739464829.

The spelling of 16440143 in words is "sixteen million, four hundred forty thousand, one hundred forty-three".