1994143 has 2 divisors, whose sum is σ = 1994144. Its totient is φ = 1994142.

The previous prime is 1994119. The next prime is 1994191. The reversal of 1994143 is 3414991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1994143 - 2⁹ = 1993631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1994543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997071 + 997072.

It is an arithmetic number, because the mean of its divisors is an integer number (997072).

2^1994143 is an apocalyptic number.

1994143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994143 is an equidigital number, since it uses as much as digits as its factorization.

1994143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 31.

The square root of 1994143 is about 1412.1412818837. The cubic root of 1994143 is about 125.8689954426.

The spelling of 1994143 in words is "one million, nine hundred ninety-four thousand, one hundred forty-three".