987123138 has 8 divisors (see below), whose sum is σ = 1974246288. Its totient is φ = 329041044.

The previous prime is 987123113. The next prime is 987123209. The reversal of 987123138 is 831321789.

It is a sphenic number, since it is the product of 3 distinct primes.

987123138 is an admirable number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 987123138.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82260256 + ... + 82260267.

It is an arithmetic number, because the mean of its divisors is an integer number (246780786).

Almost surely, 2^987123138 is an apocalyptic number.

987123138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

987123138 is a wasteful number, since it uses less digits than its factorization.

987123138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164520528.

The product of its digits is 72576, while the sum is 42.

The square root of 987123138 is about 31418.5158465514. The cubic root of 987123138 is about 995.6891559940.

The spelling of 987123138 in words is "nine hundred eighty-seven million, one hundred twenty-three thousand, one hundred thirty-eight".