8981820 has 48 divisors (see below), whose sum is σ = 27945120. Its totient is φ = 2395008.

The previous prime is 8981809. The next prime is 8981827. The reversal of 8981820 is 281898.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8981827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7777 + ... + 8856.

It is an arithmetic number, because the mean of its divisors is an integer number (582190).

Almost surely, 2^8981820 is an apocalyptic number.

It is an amenable number.

8981820 is an abundant number, since it is smaller than the sum of its proper divisors (18963300).

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

8981820 is a wasteful number, since it uses less digits than its factorization.

8981820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16651 (or 16643 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 8981820 is about 2996.9684683026. The cubic root of 8981820 is about 207.8682289154.

It can be divided in two parts, 8981 and 820, that added together give a square (9801 = 99²).

The spelling of 8981820 in words is "eight million, nine hundred eighty-one thousand, eight hundred twenty".