864143 has 4 divisors (see below), whose sum is σ = 987600. Its totient is φ = 740688.

The previous prime is 864137. The next prime is 864151. The reversal of 864143 is 341468.

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 864143 - 2⁶ = 864079 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 (864103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61718 + ... + 61731.

It is an arithmetic number, because the mean of its divisors is an integer number (246900).

2⁸⁶⁴¹⁴³ is an apocalyptic number.

864143 is a deficient number, since it is larger than the sum of its proper divisors (123457).

864143 is a wasteful number, since it uses less digits than its factorization.

864143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123456.

The product of its digits is 2304, while the sum is 26.

The square root of 864143 is about 929.5929216598. The cubic root of 864143 is about 95.2493174197.

The spelling of 864143 in words is "eight hundred sixty-four thousand, one hundred forty-three".