1891982 has 8 divisors (see below), whose sum is σ = 2987400. Its totient is φ = 896184.

The previous prime is 1891969. The next prime is 1891987. The reversal of 1891982 is 2891981.

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

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 49789 = 1891982 / (1 + 8 + 9 + 1 + 9 + 8 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891987) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 24857 + ... + 24932.

It is an arithmetic number, because the mean of its divisors is an integer number (373425).

2^1891982 is an apocalyptic number.

1891982 is a deficient number, since it is larger than the sum of its proper divisors (1095418).

1891982 is a wasteful number, since it uses less digits than its factorization.

1891982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49810.

The product of its digits is 10368, while the sum is 38.

The square root of 1891982 is about 1375.4933660327. The cubic root of 1891982 is about 123.6817628768.

Subtracting 1891982 from its reverse (2891981), we obtain a palindrome (999999).

The spelling of 1891982 in words is "one million, eight hundred ninety-one thousand, nine hundred eighty-two".