19000987 has 2 divisors, whose sum is σ = 19000988. Its totient is φ = 19000986.

The previous prime is 19000981. The next prime is 19000991. The reversal of 19000987 is 78900091.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19000987 - 2³ = 19000979 is a prime.

It is a super-2 number, since 2×19000987² = 722075013948338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19000981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9500493 + 9500494.

It is an arithmetic number, because the mean of its divisors is an integer number (9500494).

Almost surely, 2^19000987 is an apocalyptic number.

19000987 is a deficient number, since it is larger than the sum of its proper divisors (1).

19000987 is an equidigital number, since it uses as much as digits as its factorization.

19000987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 19000987 is about 4359.0121587350. The cubic root of 19000987 is about 266.8447853403.

It can be divided in two parts, 190009 and 87, that added together give a square (190096 = 436²).

The spelling of 19000987 in words is "nineteen million, nine hundred eighty-seven", and thus it is an aban number.