1866349 has 2 divisors, whose sum is σ = 1866350. Its totient is φ = 1866348.

The previous prime is 1866343. The next prime is 1866367. The reversal of 1866349 is 9436681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1397124 + 469225 = 1182^2 + 685^2 .

It is a cyclic number.

It is not a de Polignac number, because 1866349 - 2³ = 1866341 is a prime.

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, 933174 + 933175.

It is an arithmetic number, because the mean of its divisors is an integer number (933175).

2^1866349 is an apocalyptic number.

It is an amenable number.

1866349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866349 is an equidigital number, since it uses as much as digits as its factorization.

1866349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 1866349 is about 1366.1438430853. The cubic root of 1866349 is about 123.1206650711.

The spelling of 1866349 in words is "one million, eight hundred sixty-six thousand, three hundred forty-nine".