9978786 has 12 divisors (see below), whose sum is σ = 21620742. Its totient is φ = 3326256.

The previous prime is 9978767. The next prime is 9978791. The reversal of 9978786 is 6878799.

It can be written as a sum of positive squares in only one way, i.e., 5377761 + 4601025 = 2319^2 + 2145^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 277171 + ... + 277206.

Almost surely, 2^9978786 is an apocalyptic number.

9978786 is an abundant number, since it is smaller than the sum of its proper divisors (11641956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9978786 is a wasteful number, since it uses less digits than its factorization.

9978786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554385 (or 554382 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The square root of 9978786 is about 3158.9216514501. The cubic root of 9978786 is about 215.2910138878.

The spelling of 9978786 in words is "nine million, nine hundred seventy-eight thousand, seven hundred eighty-six".