1881866 has 16 divisors (see below), whose sum is σ = 3416256. Its totient is φ = 758976.

The previous prime is 1881863. The next prime is 1881881. The reversal of 1881866 is 6681881.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1881863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3716 + ... + 4191.

It is an arithmetic number, because the mean of its divisors is an integer number (213516).

2^1881866 is an apocalyptic number.

1881866 is a deficient number, since it is larger than the sum of its proper divisors (1534390).

1881866 is a wasteful number, since it uses less digits than its factorization.

1881866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7933.

The product of its digits is 18432, while the sum is 38.

The square root of 1881866 is about 1371.8112115011. The cubic root of 1881866 is about 123.4609360297.

The spelling of 1881866 in words is "one million, eight hundred eighty-one thousand, eight hundred sixty-six".