9887972 has 6 divisors (see below), whose sum is σ = 17303958. Its totient is φ = 4943984.

The previous prime is 9887971. The next prime is 9887993. The reversal of 9887972 is 2797889.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 8620096 + 1267876 = 2936^2 + 1126^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 9887972.

It is not an unprimeable number, because it can be changed into a prime (9887971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1235993 + ... + 1236000.

It is an arithmetic number, because the mean of its divisors is an integer number (2883993).

Almost surely, 2^9887972 is an apocalyptic number.

It is an amenable number.

9887972 is a deficient number, since it is larger than the sum of its proper divisors (7415986).

9887972 is a wasteful number, since it uses less digits than its factorization.

9887972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2471997 (or 2471995 counting only the distinct ones).

The product of its digits is 508032, while the sum is 50.

The square root of 9887972 is about 3144.5145889310. The cubic root of 9887972 is about 214.6359224946.

The spelling of 9887972 in words is "nine million, eight hundred eighty-seven thousand, nine hundred seventy-two".