9978507 has 72 divisors (see below), whose sum is σ = 19526832. Its totient is φ = 4878720.

The previous prime is 9978461. The next prime is 9978547. The reversal of 9978507 is 7058799.

It is not a de Polignac number, because 9978507 - 2¹⁰ = 9977483 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (9978547) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 586963 + ... + 586979.

It is an arithmetic number, because the mean of its divisors is an integer number (271206).

Almost surely, 2^9978507 is an apocalyptic number.

9978507 is a deficient number, since it is larger than the sum of its proper divisors (9548325).

9978507 is a wasteful number, since it uses less digits than its factorization.

9978507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70 (or 38 counting only the distinct ones).

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

The square root of 9978507 is about 3158.8774905020. The cubic root of 9978507 is about 215.2890074062.

It can be divided in two parts, 99 and 78507, that added together give a triangular number (78606 = T₃₉₆).

The spelling of 9978507 in words is "nine million, nine hundred seventy-eight thousand, five hundred seven".