979987 has 2 divisors, whose sum is σ = 979988. Its totient is φ = 979986.

The previous prime is 979969. The next prime is 980027. The reversal of 979987 is 789979.

It is a weak prime.

It is an emirp because it is prime and its reverse (789979) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-979987 is a prime.

It is a Chen prime.

979987 is a lucky number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 979987.

It is not a weakly prime, because it can be changed into another prime (979907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489993 + 489994.

It is an arithmetic number, because the mean of its divisors is an integer number (489994).

2⁹⁷⁹⁹⁸⁷ is an apocalyptic number.

979987 is a deficient number, since it is larger than the sum of its proper divisors (1).

979987 is an equidigital number, since it uses as much as digits as its factorization.

979987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 49.

The square root of 979987 is about 989.9429276479. The cubic root of 979987 is about 99.3283996268.

The spelling of 979987 in words is "nine hundred seventy-nine thousand, nine hundred eighty-seven".