1981846 has 4 divisors (see below), whose sum is σ = 2972772. Its totient is φ = 990922.

The previous prime is 1981813. The next prime is 1981853. The reversal of 1981846 is 6481891.

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, 495460 + ... + 495463.

It is an arithmetic number, because the mean of its divisors is an integer number (743193).

2^1981846 is an apocalyptic number.

1981846 is a deficient number, since it is larger than the sum of its proper divisors (990926).

1981846 is an equidigital number, since it uses as much as digits as its factorization.

1981846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990925.

The product of its digits is 13824, while the sum is 37.

The square root of 1981846 is about 1407.7805226668. The cubic root of 1981846 is about 125.6097356106.

The spelling of 1981846 in words is "one million, nine hundred eighty-one thousand, eight hundred forty-six".