981639712 has 96 divisors (see below), whose sum is σ = 2126113920. Its totient is φ = 444487680.

The previous prime is 981639691. The next prime is 981639719. The reversal of 981639712 is 217936189.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (981639719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1320813 + ... + 1321555.

It is an arithmetic number, because the mean of its divisors is an integer number (22147020).

Almost surely, 2^981639712 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 981639712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1063056960).

981639712 is an abundant number, since it is smaller than the sum of its proper divisors (1144474208).

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

981639712 is a wasteful number, since it uses less digits than its factorization.

981639712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866 (or 858 counting only the distinct ones).

The product of its digits is 163296, while the sum is 46.

The square root of 981639712 is about 31331.1300785656. The cubic root of 981639712 is about 993.8420616318.

The spelling of 981639712 in words is "nine hundred eighty-one million, six hundred thirty-nine thousand, seven hundred twelve".