1984891 has 2 divisors, whose sum is σ = 1984892. Its totient is φ = 1984890.

The previous prime is 1984867. The next prime is 1984897.

1984891 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1984891 - 2⁵ = 1984859 is a prime.

It is not a weakly prime, because it can be changed into another prime (1984897) 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 as a sum of consecutive naturals, namely, 992445 + 992446.

It is an arithmetic number, because the mean of its divisors is an integer number (992446).

2^1984891 is an apocalyptic number.

1984891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1984891 is an equidigital number, since it uses as much as digits as its factorization.

1984891 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1984891 is about 1408.8615971770. The cubic root of 1984891 is about 125.6740335638.

The spelling of 1984891 in words is "one million, nine hundred eighty-four thousand, eight hundred ninety-one".