9969820 has 96 divisors (see below), whose sum is σ = 26127360. Its totient is φ = 3118080.

The previous prime is 9969809. The next prime is 9969853. The reversal of 9969820 is 289699.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140385 + ... + 140455.

It is an arithmetic number, because the mean of its divisors is an integer number (272160).

Almost surely, 2^9969820 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 9969820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13063680).

9969820 is an abundant number, since it is smaller than the sum of its proper divisors (16157540).

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

9969820 is a wasteful number, since it uses less digits than its factorization.

9969820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 9969820 is about 3157.5021773548. The cubic root of 9969820 is about 215.2265144705.

It can be divided in two parts, 996 and 9820, that added together give a square (10816 = 104²).

The spelling of 9969820 in words is "nine million, nine hundred sixty-nine thousand, eight hundred twenty".