1981841 has 8 divisors (see below), whose sum is σ = 2083200. Its totient is φ = 1881792.

The previous prime is 1981813. The next prime is 1981853. The reversal of 1981841 is 1481891.

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

It is a cyclic number.

It is not a de Polignac number, because 1981841 - 2¹⁰ = 1980817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1981798 and 1981807.

It is not an unprimeable number, because it can be changed into a prime (1981891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4361 + ... + 4793.

It is an arithmetic number, because the mean of its divisors is an integer number (260400).

2^1981841 is an apocalyptic number.

It is an amenable number.

1981841 is a deficient number, since it is larger than the sum of its proper divisors (101359).

1981841 is a wasteful number, since it uses less digits than its factorization.

1981841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655.

The product of its digits is 2304, while the sum is 32.

The square root of 1981841 is about 1407.7787468207. The cubic root of 1981841 is about 125.6096299769.

The spelling of 1981841 in words is "one million, nine hundred eighty-one thousand, eight hundred forty-one".