9861020 has 96 divisors (see below), whose sum is σ = 24893568. Its totient is φ = 3244032.

The previous prime is 9860999. The next prime is 9861029. The reversal of 9861020 is 201689.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9861029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101612 + ... + 101708.

It is an arithmetic number, because the mean of its divisors is an integer number (259308).

Almost surely, 2^9861020 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 9861020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12446784).

9861020 is an abundant number, since it is smaller than the sum of its proper divisors (15032548).

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

9861020 is a wasteful number, since it uses less digits than its factorization.

9861020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 9861020 is about 3140.2261065089. The cubic root of 9861020 is about 214.4407314294.

The spelling of 9861020 in words is "nine million, eight hundred sixty-one thousand, twenty".