9897920 has 28 divisors (see below), whose sum is σ = 23570184. Its totient is φ = 3959040.

The previous prime is 9897919. The next prime is 9897929. The reversal of 9897920 is 297989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9897929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15146 + ... + 15785.

Almost surely, 2^9897920 is an apocalyptic number.

It is an amenable number.

9897920 is an abundant number, since it is smaller than the sum of its proper divisors (13672264).

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

9897920 is a wasteful number, since it uses less digits than its factorization.

9897920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30948 (or 30938 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 9897920 is about 3146.0959934497. The cubic root of 9897920 is about 214.7078780147.

The spelling of 9897920 in words is "nine million, eight hundred ninety-seven thousand, nine hundred twenty".