1981046 has 4 divisors (see below), whose sum is σ = 2971572. Its totient is φ = 990522.

The previous prime is 1981037. The next prime is 1981081. The reversal of 1981046 is 6401891.

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

It is a pancake number, because a pancake can be divided into 1981046 parts by 1990 straight cuts.

It is a Curzon number.

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, 495260 + ... + 495263.

It is an arithmetic number, because the mean of its divisors is an integer number (742893).

2^1981046 is an apocalyptic number.

1981046 is a deficient number, since it is larger than the sum of its proper divisors (990526).

1981046 is an equidigital number, since it uses as much as digits as its factorization.

1981046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990525.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1981046 is about 1407.4963587875. The cubic root of 1981046 is about 125.5928319573.

The spelling of 1981046 in words is "one million, nine hundred eighty-one thousand, forty-six".