1985743 has 2 divisors, whose sum is σ = 1985744. Its totient is φ = 1985742.

The previous prime is 1985741. The next prime is 1985759. The reversal of 1985743 is 3475891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1985743 - 2¹ = 1985741 is a prime.

Together with 1985741, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1985741) 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 as a sum of consecutive naturals, namely, 992871 + 992872.

It is an arithmetic number, because the mean of its divisors is an integer number (992872).

2^1985743 is an apocalyptic number.

1985743 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985743 is an equidigital number, since it uses as much as digits as its factorization.

1985743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The square root of 1985743 is about 1409.1639365241. The cubic root of 1985743 is about 125.6920125461.

It can be divided in two parts, 19857 and 43, that added together give a triangular number (19900 = T₁₉₉).

The spelling of 1985743 in words is "one million, nine hundred eighty-five thousand, seven hundred forty-three".