785717987 has 2 divisors, whose sum is σ = 785717988. Its totient is φ = 785717986.

The previous prime is 785717983. The next prime is 785717993. The reversal of 785717987 is 789717587.

It is a weak prime.

It is an emirp because it is prime and its reverse (789717587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 785717987 - 2² = 785717983 is a prime.

It is not a weakly prime, because it can be changed into another prime (785717981) 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, 392858993 + 392858994.

It is an arithmetic number, because the mean of its divisors is an integer number (392858994).

Almost surely, 2^785717987 is an apocalyptic number.

785717987 is a deficient number, since it is larger than the sum of its proper divisors (1).

785717987 is an equidigital number, since it uses as much as digits as its factorization.

785717987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6914880, while the sum is 59.

The square root of 785717987 is about 28030.6615512371. The cubic root of 785717987 is about 922.7602933691.

The spelling of 785717987 in words is "seven hundred eighty-five million, seven hundred seventeen thousand, nine hundred eighty-seven".