779900987 has 2 divisors, whose sum is σ = 779900988. Its totient is φ = 779900986.

The previous prime is 779900983. The next prime is 779901013. The reversal of 779900987 is 789009977.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 779900987 - 2² = 779900983 is a prime.

It is not a weakly prime, because it can be changed into another prime (779900983) 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, 389950493 + 389950494.

It is an arithmetic number, because the mean of its divisors is an integer number (389950494).

Almost surely, 2^779900987 is an apocalyptic number.

779900987 is a deficient number, since it is larger than the sum of its proper divisors (1).

779900987 is an equidigital number, since it uses as much as digits as its factorization.

779900987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000376, while the sum is 56.

The square root of 779900987 is about 27926.7074142298. The cubic root of 779900987 is about 920.4774565644.

The spelling of 779900987 in words is "seven hundred seventy-nine million, nine hundred thousand, nine hundred eighty-seven".