9978388 has 24 divisors (see below), whose sum is σ = 21131712. Its totient is φ = 4024704.

The previous prime is 9978383. The next prime is 9978427. The reversal of 9978388 is 8838799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10006 + ... + 10957.

It is an arithmetic number, because the mean of its divisors is an integer number (880488).

Almost surely, 2^9978388 is an apocalyptic number.

It is an amenable number.

9978388 is an abundant number, since it is smaller than the sum of its proper divisors (11153324).

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

9978388 is a wasteful number, since it uses less digits than its factorization.

9978388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20991 (or 20989 counting only the distinct ones).

The product of its digits is 870912, while the sum is 52.

The square root of 9978388 is about 3158.8586546409. The cubic root of 9978388 is about 215.2881515837.

It can be divided in two parts, 99 and 78388, that added together give a palindrome (78487).

The spelling of 9978388 in words is "nine million, nine hundred seventy-eight thousand, three hundred eighty-eight".