19842443 has 2 divisors, whose sum is σ = 19842444. Its totient is φ = 19842442.

The previous prime is 19842391. The next prime is 19842463. The reversal of 19842443 is 34424891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19842443 - 2⁶ = 19842379 is a prime.

It is not a weakly prime, because it can be changed into another prime (19842463) 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, 9921221 + 9921222.

It is an arithmetic number, because the mean of its divisors is an integer number (9921222).

Almost surely, 2^19842443 is an apocalyptic number.

19842443 is a deficient number, since it is larger than the sum of its proper divisors (1).

19842443 is an equidigital number, since it uses as much as digits as its factorization.

19842443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 35.

The square root of 19842443 is about 4454.4857166681. The cubic root of 19842443 is about 270.7270891728.

The spelling of 19842443 in words is "nineteen million, eight hundred forty-two thousand, four hundred forty-three".