9861880 has 32 divisors (see below), whose sum is σ = 25359840. Its totient is φ = 3381120.

The previous prime is 9861847. The next prime is 9861881. The reversal of 9861880 is 881689.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9861881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17331 + ... + 17890.

It is an arithmetic number, because the mean of its divisors is an integer number (792495).

Almost surely, 2^9861880 is an apocalyptic number.

It is an amenable number.

9861880 is an abundant number, since it is smaller than the sum of its proper divisors (15497960).

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

9861880 is a wasteful number, since it uses less digits than its factorization.

9861880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35239 (or 35235 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 9861880 is about 3140.3630363383. The cubic root of 9861880 is about 214.4469651884.

The spelling of 9861880 in words is "nine million, eight hundred sixty-one thousand, eight hundred eighty".