639143 has 2 divisors, whose sum is σ = 639144. Its totient is φ = 639142.

The previous prime is 639137. The next prime is 639151. The reversal of 639143 is 341936.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639143 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 639143.

It is not a weakly prime, because it can be changed into another prime (639043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319571 + 319572.

It is an arithmetic number, because the mean of its divisors is an integer number (319572).

2⁶³⁹¹⁴³ is an apocalyptic number.

639143 is a deficient number, since it is larger than the sum of its proper divisors (1).

639143 is an equidigital number, since it uses as much as digits as its factorization.

639143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 26.

The square root of 639143 is about 799.4641955710. The cubic root of 639143 is about 86.1389047832.

The spelling of 639143 in words is "six hundred thirty-nine thousand, one hundred forty-three".