1981466 has 4 divisors (see below), whose sum is σ = 2972202. Its totient is φ = 990732.

The previous prime is 1981457. The next prime is 1981471. The reversal of 1981466 is 6641891.

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

It can be written as a sum of positive squares in only one way, i.e., 1615441 + 366025 = 1271^2 + 605^2 .

It is a super-3 number, since 3×1981466³ = 23338940065011908088, which contains 333 as substring.

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 as a sum of consecutive naturals, namely, 495365 + ... + 495368.

2^1981466 is an apocalyptic number.

1981466 is a deficient number, since it is larger than the sum of its proper divisors (990736).

1981466 is an equidigital number, since it uses as much as digits as its factorization.

1981466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990735.

The product of its digits is 10368, while the sum is 35.

The square root of 1981466 is about 1407.6455519768. The cubic root of 1981466 is about 125.6017069426.

The spelling of 1981466 in words is "one million, nine hundred eighty-one thousand, four hundred sixty-six".