981823 has 2 divisors, whose sum is σ = 981824. Its totient is φ = 981822.

The previous prime is 981817. The next prime is 981887. The reversal of 981823 is 328189.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 981823 - 2⁹ = 981311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490911 + 490912.

It is an arithmetic number, because the mean of its divisors is an integer number (490912).

2⁹⁸¹⁸²³ is an apocalyptic number.

981823 is a deficient number, since it is larger than the sum of its proper divisors (1).

981823 is an equidigital number, since it uses as much as digits as its factorization.

981823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 31.

The square root of 981823 is about 990.8698199057. The cubic root of 981823 is about 99.3903913241.

The spelling of 981823 in words is "nine hundred eighty-one thousand, eight hundred twenty-three".