9978973 has 4 divisors (see below), whose sum is σ = 9989980. Its totient is φ = 9967968.

The previous prime is 9978961. The next prime is 9978989. The reversal of 9978973 is 3798799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3798799 = 191 ⋅19889.

It can be written as a sum of positive squares in 2 ways, for example, as 9498724 + 480249 = 3082^2 + 693^2 .

It is a cyclic number.

It is not a de Polignac number, because 9978973 - 2⁹ = 9978461 is a prime.

It is a Duffinian number.

9978973 is a modest number, since divided by 8973 gives 997 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 9978973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9972973) 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, 4008 + ... + 6001.

It is an arithmetic number, because the mean of its divisors is an integer number (2497495).

Almost surely, 2^9978973 is an apocalyptic number.

It is an amenable number.

9978973 is a deficient number, since it is larger than the sum of its proper divisors (11007).

9978973 is a wasteful number, since it uses less digits than its factorization.

9978973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11006.

The product of its digits is 857304, while the sum is 52.

The square root of 9978973 is about 3158.9512500195. The cubic root of 9978973 is about 215.2923587130.

It can be divided in two parts, 997 and 8973, that multiplied together give a square (8946081 = 2991²).

The spelling of 9978973 in words is "nine million, nine hundred seventy-eight thousand, nine hundred seventy-three".