9897209440 has 48 divisors (see below), whose sum is σ = 24612804720. Its totient is φ = 3750520320.

The previous prime is 9897209429. The next prime is 9897209471. The reversal of 9897209440 is 449027989.

It is a happy number.

It is a super-2 number, since 2×9897209440² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1624791 + ... + 1630870.

It is an arithmetic number, because the mean of its divisors is an integer number (512766765).

Almost surely, 2^9897209440 is an apocalyptic number.

It is an amenable number.

9897209440 is an abundant number, since it is smaller than the sum of its proper divisors (14715595280).

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

9897209440 is a wasteful number, since it uses less digits than its factorization.

9897209440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3255695 (or 3255687 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 9897209440 is about 99484.7196307051. The cubic root of 9897209440 is about 2147.0274001666.

The spelling of 9897209440 in words is "nine billion, eight hundred ninety-seven million, two hundred nine thousand, four hundred forty".