9971538 has 32 divisors (see below), whose sum is σ = 20486400. Its totient is φ = 3234816.

The previous prime is 9971519. The next prime is 9971539. The reversal of 9971538 is 8351799.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 9971538.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9971539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51570 + ... + 51762.

It is an arithmetic number, because the mean of its divisors is an integer number (640200).

Almost surely, 2^9971538 is an apocalyptic number.

9971538 is an abundant number, since it is smaller than the sum of its proper divisors (10514862).

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

9971538 is a wasteful number, since it uses less digits than its factorization.

9971538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386.

The product of its digits is 68040, while the sum is 42.

The square root of 9971538 is about 3157.7742161212. The cubic root of 9971538 is about 215.2388763759.

The spelling of 9971538 in words is "nine million, nine hundred seventy-one thousand, five hundred thirty-eight".