9979788 has 144 divisors (see below), whose sum is σ = 31153920. Its totient is φ = 2426112.

The previous prime is 9979777. The next prime is 9979789. The reversal of 9979788 is 8879799.

It is a happy number.

9979788 is nontrivially palindromic in base 11.

It is a Harshad number since it is a multiple of its sum of digits (57).

Its product of digits (2286144) is a multiple of the sum of its prime divisors (81).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9979789) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 269706 + ... + 269742.

Almost surely, 2^9979788 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9979788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15576960).

9979788 is an abundant number, since it is smaller than the sum of its proper divisors (21174132).

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

9979788 is a wasteful number, since it uses less digits than its factorization.

9979788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 81 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 57.

The square root of 9979788 is about 3159.0802458944. The cubic root of 9979788 is about 215.2982196533.

The spelling of 9979788 in words is "nine million, nine hundred seventy-nine thousand, seven hundred eighty-eight".