9997139440 has 20 divisors (see below), whose sum is σ = 23243349384. Its totient is φ = 3998855744.

The previous prime is 9997139437. The next prime is 9997139441. The reversal of 9997139440 is 449317999.

9997139440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997139441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62482042 + ... + 62482201.

Almost surely, 2^9997139440 is an apocalyptic number.

It is an amenable number.

9997139440 is an abundant number, since it is smaller than the sum of its proper divisors (13246209944).

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

9997139440 is a wasteful number, since it uses less digits than its factorization.

9997139440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124964256 (or 124964250 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 55.

The square root of 9997139440 is about 99985.6961770032. The cubic root of 9997139440 is about 2154.2292407841.

The spelling of 9997139440 in words is "nine billion, nine hundred ninety-seven million, one hundred thirty-nine thousand, four hundred forty".