9885978 has 12 divisors (see below), whose sum is σ = 21419658. Its totient is φ = 3295320.

The previous prime is 9885913. The next prime is 9885979. The reversal of 9885978 is 8795889.

9885978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9529569 + 356409 = 3087^2 + 597^2 .

It is a super-2 number, since 2×9885978² = 195465122032968, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9885979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 274593 + ... + 274628.

Almost surely, 2^9885978 is an apocalyptic number.

9885978 is an abundant number, since it is smaller than the sum of its proper divisors (11533680).

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

9885978 is a wasteful number, since it uses less digits than its factorization.

9885978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549229 (or 549226 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 54.

The square root of 9885978 is about 3144.1975128799. The cubic root of 9885978 is about 214.6214937590.

The spelling of 9885978 in words is "nine million, eight hundred eighty-five thousand, nine hundred seventy-eight".