1866343 has 2 divisors, whose sum is σ = 1866344. Its totient is φ = 1866342.

The previous prime is 1866341. The next prime is 1866349. The reversal of 1866343 is 3436681.

It is a weak prime.

It is an emirp because it is prime and its reverse (3436681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1866343 - 2¹ = 1866341 is a prime.

Together with 1866341, 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 (1866341) 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, 933171 + 933172.

It is an arithmetic number, because the mean of its divisors is an integer number (933172).

2^1866343 is an apocalyptic number.

1866343 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866343 is an equidigital number, since it uses as much as digits as its factorization.

1866343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 31.

The square root of 1866343 is about 1366.1416471216. The cubic root of 1866343 is about 123.1205331335.

It can be divided in two parts, 1866 and 343, that added together give a square (2209 = 47²).

The spelling of 1866343 in words is "one million, eight hundred sixty-six thousand, three hundred forty-three".