1866331 has 2 divisors, whose sum is σ = 1866332. Its totient is φ = 1866330.

The previous prime is 1866307. The next prime is 1866341. The reversal of 1866331 is 1336681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1866331 - 2⁷ = 1866203 is a prime.

It is a super-2 number, since 2×1866331² = 6966382803122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1866331.

It is not a weakly prime, because it can be changed into another prime (1866301) 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, 933165 + 933166.

It is an arithmetic number, because the mean of its divisors is an integer number (933166).

2^1866331 is an apocalyptic number.

1866331 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866331 is an equidigital number, since it uses as much as digits as its factorization.

1866331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The square root of 1866331 is about 1366.1372551834. The cubic root of 1866331 is about 123.1202692575.

It can be divided in two parts, 1866 and 331, that added together give a cube (2197 = 13³).

The spelling of 1866331 in words is "one million, eight hundred sixty-six thousand, three hundred thirty-one".