9771920 has 20 divisors (see below), whose sum is σ = 22719900. Its totient is φ = 3908736.

The previous prime is 9771907. The next prime is 9771953. The reversal of 9771920 is 291779.

It can be written as a sum of positive squares in 2 ways, for example, as 3857296 + 5914624 = 1964^2 + 2432^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60995 + ... + 61154.

It is an arithmetic number, because the mean of its divisors is an integer number (1135995).

Almost surely, 2^9771920 is an apocalyptic number.

It is an amenable number.

9771920 is an abundant number, since it is smaller than the sum of its proper divisors (12947980).

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

9771920 is a wasteful number, since it uses less digits than its factorization.

9771920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122162 (or 122156 counting only the distinct ones).

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 9771920 is about 3126.0070377400. The cubic root of 9771920 is about 213.7929111436.

The spelling of 9771920 in words is "nine million, seven hundred seventy-one thousand, nine hundred twenty".