9978505 has 8 divisors (see below), whose sum is σ = 12023424. Its totient is φ = 7950000.

The previous prime is 9978461. The next prime is 9978547. The reversal of 9978505 is 5058799.

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

It is not a de Polignac number, because 9978505 - 2⁹ = 9977993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2721 + ... + 5230.

It is an arithmetic number, because the mean of its divisors is an integer number (1502928).

Almost surely, 2^9978505 is an apocalyptic number.

It is an amenable number.

9978505 is a deficient number, since it is larger than the sum of its proper divisors (2044919).

9978505 is a wasteful number, since it uses less digits than its factorization.

9978505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8207.

The product of its (nonzero) digits is 113400, while the sum is 43.

The square root of 9978505 is about 3158.8771739338. The cubic root of 9978505 is about 215.2889930227.

The spelling of 9978505 in words is "nine million, nine hundred seventy-eight thousand, five hundred five".