987911823 has 4 divisors (see below), whose sum is σ = 1317215768. Its totient is φ = 658607880.

The previous prime is 987911809. The next prime is 987911849. The reversal of 987911823 is 328119789.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 987911823 - 2¹⁴ = 987895439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987911863) 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 in 3 ways as a sum of consecutive naturals, for example, 164651968 + ... + 164651973.

It is an arithmetic number, because the mean of its divisors is an integer number (329303942).

Almost surely, 2^987911823 is an apocalyptic number.

987911823 is a deficient number, since it is larger than the sum of its proper divisors (329303945).

987911823 is a wasteful number, since it uses less digits than its factorization.

987911823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329303944.

The product of its digits is 217728, while the sum is 48.

The square root of 987911823 is about 31431.0646176677. The cubic root of 987911823 is about 995.9542617422.

The spelling of 987911823 in words is "nine hundred eighty-seven million, nine hundred eleven thousand, eight hundred twenty-three".