1866143 has 2 divisors, whose sum is σ = 1866144. Its totient is φ = 1866142.

The previous prime is 1866131. The next prime is 1866191. The reversal of 1866143 is 3416681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1866143 - 2⁴ = 1866127 is a prime.

It is a Chen prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1866113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933071 + 933072.

It is an arithmetic number, because the mean of its divisors is an integer number (933072).

2^1866143 is an apocalyptic number.

1866143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866143 is an equidigital number, since it uses as much as digits as its factorization.

1866143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 1866143 is about 1366.0684463086. The cubic root of 1866143 is about 123.1161350519.

The spelling of 1866143 in words is "one million, eight hundred sixty-six thousand, one hundred forty-three".