9972787 has 4 divisors (see below), whose sum is σ = 10879416. Its totient is φ = 9066160.

The previous prime is 9972779. The next prime is 9972803. The reversal of 9972787 is 7872799.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9972787 - 2³ = 9972779 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9972787.

It is not an unprimeable number, because it can be changed into a prime (9972757) 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, 453298 + ... + 453319.

It is an arithmetic number, because the mean of its divisors is an integer number (2719854).

Almost surely, 2^9972787 is an apocalyptic number.

9972787 is a deficient number, since it is larger than the sum of its proper divisors (906629).

9972787 is a wasteful number, since it uses less digits than its factorization.

9972787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906628.

The product of its digits is 444528, while the sum is 49.

The square root of 9972787 is about 3157.9719758098. The cubic root of 9972787 is about 215.2478626905.

Subtracting from 9972787 its product of digits (444528), we obtain a palindrome (9528259).

The spelling of 9972787 in words is "nine million, nine hundred seventy-two thousand, seven hundred eighty-seven".