983987 has 2 divisors, whose sum is σ = 983988. Its totient is φ = 983986.

The previous prime is 983951. The next prime is 983993. The reversal of 983987 is 789389.

It is a strong prime.

It is an emirp because it is prime and its reverse (789389) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 983987 - 2⁶ = 983923 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 983987.

It is not a weakly prime, because it can be changed into another prime (923987) 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, 491993 + 491994.

It is an arithmetic number, because the mean of its divisors is an integer number (491994).

2⁹⁸³⁹⁸⁷ is an apocalyptic number.

983987 is a deficient number, since it is larger than the sum of its proper divisors (1).

983987 is an equidigital number, since it uses as much as digits as its factorization.

983987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 983987 is about 991.9611887569. The cubic root of 983987 is about 99.4633586454.

The spelling of 983987 in words is "nine hundred eighty-three thousand, nine hundred eighty-seven".