9978754 has 4 divisors (see below), whose sum is σ = 14968134. Its totient is φ = 4989376.

The previous prime is 9978739. The next prime is 9978767. The reversal of 9978754 is 4578799.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4578799 = 139 ⋅32941.

It can be written as a sum of positive squares in only one way, i.e., 9753129 + 225625 = 3123^2 + 475^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 9978698 and 9978707.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2494687 + ... + 2494690.

Almost surely, 2^9978754 is an apocalyptic number.

9978754 is a deficient number, since it is larger than the sum of its proper divisors (4989380).

9978754 is a wasteful number, since it uses less digits than its factorization.

9978754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4989379.

The product of its digits is 635040, while the sum is 49.

The square root of 9978754 is about 3158.9165864264. The cubic root of 9978754 is about 215.2907837556.

The spelling of 9978754 in words is "nine million, nine hundred seventy-eight thousand, seven hundred fifty-four".