1981874 has 8 divisors (see below), whose sum is σ = 3008880. Its totient is φ = 978916.

The previous prime is 1981867. The next prime is 1981879. The reversal of 1981874 is 4781891.

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

It is not an unprimeable number, because it can be changed into a prime (1981879) 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, 5804 + ... + 6135.

It is an arithmetic number, because the mean of its divisors is an integer number (376110).

2^1981874 is an apocalyptic number.

1981874 is a deficient number, since it is larger than the sum of its proper divisors (1027006).

1981874 is a wasteful number, since it uses less digits than its factorization.

1981874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12024.

The product of its digits is 16128, while the sum is 38.

The square root of 1981874 is about 1407.7904673637. The cubic root of 1981874 is about 125.6103271560.

The spelling of 1981874 in words is "one million, nine hundred eighty-one thousand, eight hundred seventy-four".