9970987 has 4 divisors (see below), whose sum is σ = 10738000. Its totient is φ = 9203976.

The previous prime is 9970981. The next prime is 9971033. The reversal of 9970987 is 7890799.

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 9970987 - 2⁷ = 9970859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9970987.

It is not an unprimeable number, because it can be changed into a prime (9970981) 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, 383487 + ... + 383512.

It is an arithmetic number, because the mean of its divisors is an integer number (2684500).

Almost surely, 2^9970987 is an apocalyptic number.

9970987 is a deficient number, since it is larger than the sum of its proper divisors (767013).

9970987 is a wasteful number, since it uses less digits than its factorization.

9970987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767012.

The product of its (nonzero) digits is 285768, while the sum is 49.

The square root of 9970987 is about 3157.6869699196. The cubic root of 9970987 is about 215.2349117984.

The spelling of 9970987 in words is "nine million, nine hundred seventy thousand, nine hundred eighty-seven".