989990488874 has 4 divisors (see below), whose sum is σ = 1484985733314. Its totient is φ = 494995244436.

The previous prime is 989990488807. The next prime is 989990488889. The reversal of 989990488874 is 478884099989.

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

It can be written as a sum of positive squares in only one way, i.e., 519058288849 + 470932200025 = 720457^2 + 686245^2 .

It is a junction number, because it is equal to n+sod(n) for n = 989990488792 and 989990488801.

It is an unprimeable number.

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, 247497622217 + ... + 247497622220.

Almost surely, 2^989990488874 is an apocalyptic number.

989990488874 is a deficient number, since it is larger than the sum of its proper divisors (494995244440).

989990488874 is a wasteful number, since it uses less digits than its factorization.

989990488874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494995244439.

The product of its (nonzero) digits is 3009871872, while the sum is 83.

The spelling of 989990488874 in words is "nine hundred eighty-nine billion, nine hundred ninety million, four hundred eighty-eight thousand, eight hundred seventy-four".