779909987 has 2 divisors, whose sum is σ = 779909988. Its totient is φ = 779909986.

The previous prime is 779909959. The next prime is 779909993. The reversal of 779909987 is 789909977.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 779909987 - 2¹⁴ = 779893603 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (779909947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389954993 + 389954994.

It is an arithmetic number, because the mean of its divisors is an integer number (389954994).

Almost surely, 2^779909987 is an apocalyptic number.

779909987 is a deficient number, since it is larger than the sum of its proper divisors (1).

779909987 is an equidigital number, since it uses as much as digits as its factorization.

779909987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18003384, while the sum is 65.

The square root of 779909987 is about 27926.8685498392. The cubic root of 779909987 is about 920.4809972982.

The spelling of 779909987 in words is "seven hundred seventy-nine million, nine hundred nine thousand, nine hundred eighty-seven".