987217923 has 4 divisors (see below), whose sum is σ = 1316290568. Its totient is φ = 658145280.

The previous prime is 987217877. The next prime is 987217927. The reversal of 987217923 is 329712789.

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

It is not a de Polignac number, because 987217923 - 2⁹ = 987217411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987217927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164536318 + ... + 164536323.

It is an arithmetic number, because the mean of its divisors is an integer number (329072642).

Almost surely, 2^987217923 is an apocalyptic number.

987217923 is a deficient number, since it is larger than the sum of its proper divisors (329072645).

987217923 is a wasteful number, since it uses less digits than its factorization.

987217923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329072644.

The product of its digits is 381024, while the sum is 48.

The square root of 987217923 is about 31420.0242361460. The cubic root of 987217923 is about 995.7210241478.

The spelling of 987217923 in words is "nine hundred eighty-seven million, two hundred seventeen thousand, nine hundred twenty-three".