989474743920 has 640 divisors, whose sum is σ = 3527342235648. Its totient is φ = 227599257600.

The previous prime is 989474743871. The next prime is 989474743927. The reversal of 989474743920 is 29347474989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989474743927) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 629836735 + ... + 629838305.

Almost surely, 2^989474743920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 989474743920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1763671117824).

989474743920 is an abundant number, since it is smaller than the sum of its proper divisors (2537867491728).

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

989474743920 is a wasteful number, since it uses less digits than its factorization.

989474743920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821 (or 1815 counting only the distinct ones).

The product of its (nonzero) digits is 109734912, while the sum is 66.

The spelling of 989474743920 in words is "nine hundred eighty-nine billion, four hundred seventy-four million, seven hundred forty-three thousand, nine hundred twenty".