9978075 has 36 divisors (see below), whose sum is σ = 18189808. Its totient is φ = 5227200.

The previous prime is 9978041. The next prime is 9978079. The reversal of 9978075 is 5708799.

It is not a de Polignac number, because 9978075 - 2⁸ = 9977819 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 9978075.

It is not an unprimeable number, because it can be changed into a prime (9978079) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 13362 + ... + 14088.

Almost surely, 2^9978075 is an apocalyptic number.

9978075 is a deficient number, since it is larger than the sum of its proper divisors (8211733).

9978075 is a wasteful number, since it uses less digits than its factorization.

9978075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804 (or 796 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 45.

The square root of 9978075 is about 3158.8091110417. The cubic root of 9978075 is about 215.2859005221.

The spelling of 9978075 in words is "nine million, nine hundred seventy-eight thousand, seventy-five".