9980861 has 16 divisors (see below), whose sum is σ = 11327040. Its totient is φ = 8714880.

The previous prime is 9980857. The next prime is 9980863. The reversal of 9980861 is 1680899.

9980861 = 199² + 200² + ... + 335².

It is a cyclic number.

It is not a de Polignac number, because 9980861 - 2² = 9980857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9980863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55670 + ... + 55848.

It is an arithmetic number, because the mean of its divisors is an integer number (707940).

Almost surely, 2^9980861 is an apocalyptic number.

It is an amenable number.

9980861 is a deficient number, since it is larger than the sum of its proper divisors (1346179).

9980861 is a wasteful number, since it uses less digits than its factorization.

9980861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 9980861 is about 3159.2500692411. The cubic root of 9980861 is about 215.3059354723.

The spelling of 9980861 in words is "nine million, nine hundred eighty thousand, eight hundred sixty-one".