1981066 has 8 divisors (see below), whose sum is σ = 2980800. Its totient is φ = 987468.

The previous prime is 1981037. The next prime is 1981081. The reversal of 1981066 is 6601891.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 11.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 616 + ... + 2083.

It is an arithmetic number, because the mean of its divisors is an integer number (372600).

2^1981066 is an apocalyptic number.

1981066 is a deficient number, since it is larger than the sum of its proper divisors (999734).

1981066 is a wasteful number, since it uses less digits than its factorization.

1981066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3068.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1981066 is about 1407.5034635837. The cubic root of 1981066 is about 125.5932546041.

The spelling of 1981066 in words is "one million, nine hundred eighty-one thousand, sixty-six".