1728743987 has 2 divisors, whose sum is σ = 1728743988. Its totient is φ = 1728743986.

The previous prime is 1728743971. The next prime is 1728744001. The reversal of 1728743987 is 7893478271.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1728743987 - 2⁴ = 1728743971 is a prime.

It is not a weakly prime, because it can be changed into another prime (1728743087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 864371993 + 864371994.

It is an arithmetic number, because the mean of its divisors is an integer number (864371994).

Almost surely, 2^1728743987 is an apocalyptic number.

1728743987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1728743987 is an equidigital number, since it uses as much as digits as its factorization.

1728743987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4741632, while the sum is 56.

The square root of 1728743987 is about 41578.1671914480. The cubic root of 1728743987 is about 1200.1721945027.

The spelling of 1728743987 in words is "one billion, seven hundred twenty-eight million, seven hundred forty-three thousand, nine hundred eighty-seven".