19840823 has 2 divisors, whose sum is σ = 19840824. Its totient is φ = 19840822.

The previous prime is 19840817. The next prime is 19840841. The reversal of 19840823 is 32804891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19840823 - 2¹⁴ = 19824439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19810823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9920411 + 9920412.

It is an arithmetic number, because the mean of its divisors is an integer number (9920412).

Almost surely, 2^19840823 is an apocalyptic number.

19840823 is a deficient number, since it is larger than the sum of its proper divisors (1).

19840823 is an equidigital number, since it uses as much as digits as its factorization.

19840823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 19840823 is about 4454.3038737832. The cubic root of 19840823 is about 270.7197212995.

The spelling of 19840823 in words is "nineteen million, eight hundred forty thousand, eight hundred twenty-three".