1881806 has 4 divisors (see below), whose sum is σ = 2822712. Its totient is φ = 940902.

The previous prime is 1881799. The next prime is 1881811. The reversal of 1881806 is 6081881.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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, 470450 + ... + 470453.

It is an arithmetic number, because the mean of its divisors is an integer number (705678).

2^1881806 is an apocalyptic number.

1881806 is a deficient number, since it is larger than the sum of its proper divisors (940906).

1881806 is an equidigital number, since it uses as much as digits as its factorization.

1881806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940905.

The product of its (nonzero) digits is 3072, while the sum is 32.

The square root of 1881806 is about 1371.7893424283. The cubic root of 1881806 is about 123.4596239039.

The spelling of 1881806 in words is "one million, eight hundred eighty-one thousand, eight hundred six".