19842001 has 2 divisors, whose sum is σ = 19842002. Its totient is φ = 19842000.

The previous prime is 19841999. The next prime is 19842007. The reversal of 19842001 is 10024891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19793601 + 48400 = 4449^2 + 220^2 .

It is a cyclic number.

It is not a de Polignac number, because 19842001 - 2¹ = 19841999 is a prime.

Together with 19841999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19842007) 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, 9921000 + 9921001.

It is an arithmetic number, because the mean of its divisors is an integer number (9921001).

Almost surely, 2^19842001 is an apocalyptic number.

It is an amenable number.

19842001 is a deficient number, since it is larger than the sum of its proper divisors (1).

19842001 is an equidigital number, since it uses as much as digits as its factorization.

19842001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 19842001 is about 4454.4361034816. The cubic root of 19842001 is about 270.7250789657.

Adding to 19842001 its reverse (10024891), we get a palindrome (29866892).

The spelling of 19842001 in words is "nineteen million, eight hundred forty-two thousand, one".