19980487 has 2 divisors, whose sum is σ = 19980488. Its totient is φ = 19980486.

The previous prime is 19980473. The next prime is 19980503. The reversal of 19980487 is 78408991.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19980487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19980427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9990243 + 9990244.

It is an arithmetic number, because the mean of its divisors is an integer number (9990244).

Almost surely, 2^19980487 is an apocalyptic number.

19980487 is a deficient number, since it is larger than the sum of its proper divisors (1).

19980487 is an equidigital number, since it uses as much as digits as its factorization.

19980487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 19980487 is about 4469.9538028933. The cubic root of 19980487 is about 271.3534555497.

The spelling of 19980487 in words is "nineteen million, nine hundred eighty thousand, four hundred eighty-seven".