9871776 has 72 divisors (see below), whose sum is σ = 28383264. Its totient is φ = 3254400.

The previous prime is 9871759. The next prime is 9871789. The reversal of 9871776 is 6771789.

Added to its reverse (6771789) it gives a triangular number (16643565 = T₅₇₆₉).

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×9871776² = 194903922788352, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43375 + ... + 43601.

It is an arithmetic number, because the mean of its divisors is an integer number (394212).

Almost surely, 2^9871776 is an apocalyptic number.

9871776 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9871776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14191632).

9871776 is an abundant number, since it is smaller than the sum of its proper divisors (18511488).

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

9871776 is a wasteful number, since it uses less digits than its factorization.

9871776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394 (or 383 counting only the distinct ones).

The product of its digits is 148176, while the sum is 45.

The square root of 9871776 is about 3141.9382552813. The cubic root of 9871776 is about 214.5186708445.

Adding to 9871776 its reverse (6771789), we get a triangular number (16643565 = T₅₇₆₉).

The spelling of 9871776 in words is "nine million, eight hundred seventy-one thousand, seven hundred seventy-six".