9978506 has 8 divisors (see below), whose sum is σ = 14987460. Its totient is φ = 4982688.

The previous prime is 9978461. The next prime is 9978547. The reversal of 9978506 is 6058799.

It can be written as a sum of positive squares in 2 ways, for example, as 7890481 + 2088025 = 2809^2 + 1445^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1091 + ... + 4598.

Almost surely, 2^9978506 is an apocalyptic number.

9978506 is a deficient number, since it is larger than the sum of its proper divisors (5008954).

9978506 is a wasteful number, since it uses less digits than its factorization.

9978506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6568.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 9978506 is about 3158.8773322179. The cubic root of 9978506 is about 215.2890002144.

The spelling of 9978506 in words is "nine million, nine hundred seventy-eight thousand, five hundred six".