987899923 has 2 divisors, whose sum is σ = 987899924. Its totient is φ = 987899922.

The previous prime is 987899921. The next prime is 987899929. The reversal of 987899923 is 329998789.

It is a weak prime.

It is an emirp because it is prime and its reverse (329998789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 987899923 - 2¹ = 987899921 is a prime.

Together with 987899921, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (987899921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493949961 + 493949962.

It is an arithmetic number, because the mean of its divisors is an integer number (493949962).

Almost surely, 2^987899923 is an apocalyptic number.

987899923 is a deficient number, since it is larger than the sum of its proper divisors (1).

987899923 is an equidigital number, since it uses as much as digits as its factorization.

987899923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17635968, while the sum is 64.

The square root of 987899923 is about 31430.8753139330. The cubic root of 987899923 is about 995.9502627674.

The spelling of 987899923 in words is "nine hundred eighty-seven million, eight hundred ninety-nine thousand, nine hundred twenty-three".