981235920 has 480 divisors, whose sum is σ = 3859181568. Its totient is φ = 201793536.

The previous prime is 981235897. The next prime is 981235939. The reversal of 981235920 is 29532189.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 20877337 + ... + 20877383.

Almost surely, 2^981235920 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 981235920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1929590784).

981235920 is an abundant number, since it is smaller than the sum of its proper divisors (2877945648).

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

981235920 is a wasteful number, since it uses less digits than its factorization.

981235920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 981235920 is about 31324.6854732813. The cubic root of 981235920 is about 993.7057724868.

The spelling of 981235920 in words is "nine hundred eighty-one million, two hundred thirty-five thousand, nine hundred twenty".