19963487 has 2 divisors, whose sum is σ = 19963488. Its totient is φ = 19963486.

The previous prime is 19963477. The next prime is 19963523. The reversal of 19963487 is 78436991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19963487 - 2⁸ = 19963231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19963477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9981743 + 9981744.

It is an arithmetic number, because the mean of its divisors is an integer number (9981744).

Almost surely, 2^19963487 is an apocalyptic number.

19963487 is a deficient number, since it is larger than the sum of its proper divisors (1).

19963487 is an equidigital number, since it uses as much as digits as its factorization.

19963487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 19963487 is about 4468.0518125913. The cubic root of 19963487 is about 271.2764751495.

The spelling of 19963487 in words is "nineteen million, nine hundred sixty-three thousand, four hundred eighty-seven".