2143643 has 4 divisors (see below), whose sum is σ = 2156208.
Its totient is φ = 2131080.
The previous prime is 2143627. The next prime is 2143667. The reversal of 2143643 is 3463412.
It is a happy number.
2143643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
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 2143643 - 24 = 2143627 is a prime.
It is a super-2 number, since 2×21436432 = 9190410622898, which contains 22 as substring.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (2143243) 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, 6023 + ... + 6368.
It is an arithmetic number, because the mean of its divisors is an integer number (539052).
22143643 is an apocalyptic number.
2143643 is a deficient number, since it is larger than the sum of its proper divisors (12565).
2143643 is a wasteful number, since it uses less digits than its factorization.
2143643 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 12564.
The product of its digits is 1728, while the sum is 23.
The square root of 2143643 is about 1464.1185061326.
The cubic root of 2143643 is about 128.9389571576.
The spelling of 2143643 in words is "two million, one hundred forty-three thousand, six hundred forty-three".