1866043 has 2 divisors, whose sum is σ = 1866044. Its totient is φ = 1866042.

The previous prime is 1866037. The next prime is 1866049. The reversal of 1866043 is 3406681.

It is a balanced prime because it is at equal distance from previous prime (1866037) and next prime (1866049).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1866043 is a prime.

It is a super-3 number, since 3×1866043³ = 19493337236024344521, which contains 333 as substring.

It is equal to p₁₃₉₆₈₁ and since 1866043 and 139681 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1866049) 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, 933021 + 933022.

It is an arithmetic number, because the mean of its divisors is an integer number (933022).

2^1866043 is an apocalyptic number.

1866043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866043 is an equidigital number, since it uses as much as digits as its factorization.

1866043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1866043 is about 1366.0318444312. The cubic root of 1866043 is about 123.1139358933.

The spelling of 1866043 in words is "one million, eight hundred sixty-six thousand, forty-three".