1981849 has 8 divisors (see below), whose sum is σ = 2044800. Its totient is φ = 1919856.

The previous prime is 1981813. The next prime is 1981853. The reversal of 1981849 is 9481891.

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

It is not a de Polignac number, because 1981849 - 2⁹ = 1981337 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 6862 + ... + 7144.

It is an arithmetic number, because the mean of its divisors is an integer number (255600).

2^1981849 is an apocalyptic number.

It is an amenable number.

1981849 is a deficient number, since it is larger than the sum of its proper divisors (62951).

1981849 is a wasteful number, since it uses less digits than its factorization.

1981849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479.

The product of its digits is 20736, while the sum is 40.

The square root of 1981849 is about 1407.7815881734. The cubic root of 1981849 is about 125.6097989907.

The spelling of 1981849 in words is "one million, nine hundred eighty-one thousand, eight hundred forty-nine".