19840463 has 2 divisors, whose sum is σ = 19840464. Its totient is φ = 19840462.

The previous prime is 19840459. The next prime is 19840487. The reversal of 19840463 is 36404891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19840463 - 2² = 19840459 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19840663) 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, 9920231 + 9920232.

It is an arithmetic number, because the mean of its divisors is an integer number (9920232).

Almost surely, 2^19840463 is an apocalyptic number.

19840463 is a deficient number, since it is larger than the sum of its proper divisors (1).

19840463 is an equidigital number, since it uses as much as digits as its factorization.

19840463 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 19840463 is about 4454.2634632451. The cubic root of 19840463 is about 270.7180839398.

The spelling of 19840463 in words is "nineteen million, eight hundred forty thousand, four hundred sixty-three".