989720944 has 20 divisors (see below), whose sum is σ = 2018510440. Its totient is φ = 468815040.

The previous prime is 989720939. The next prime is 989720947. The reversal of 989720944 is 449027989.

It is a happy number.

It is a super-2 number, since 2×989720944² = 1959095093984502272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 989720891 and 989720900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989720947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1627527 + ... + 1628134.

It is an arithmetic number, because the mean of its divisors is an integer number (100925522).

Almost surely, 2^989720944 is an apocalyptic number.

It is an amenable number.

989720944 is an abundant number, since it is smaller than the sum of its proper divisors (1028789496).

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

989720944 is a wasteful number, since it uses less digits than its factorization.

989720944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3255688 (or 3255682 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 989720944 is about 31459.8306416293. The cubic root of 989720944 is about 996.5618406074.

The spelling of 989720944 in words is "nine hundred eighty-nine million, seven hundred twenty thousand, nine hundred forty-four".