9979242 has 64 divisors (see below), whose sum is σ = 25132800. Its totient is φ = 2624832.

The previous prime is 9979213. The next prime is 9979243. The reversal of 9979242 is 2429799.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 9979194 and 9979203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9979243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26568 + ... + 26940.

It is an arithmetic number, because the mean of its divisors is an integer number (392700).

Almost surely, 2^9979242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9979242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12566400).

9979242 is an abundant number, since it is smaller than the sum of its proper divisors (15153558).

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

9979242 is a wasteful number, since it uses less digits than its factorization.

9979242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412 (or 398 counting only the distinct ones).

The product of its digits is 81648, while the sum is 42.

The square root of 9979242 is about 3158.9938271545. The cubic root of 9979242 is about 215.2942932182.

The spelling of 9979242 in words is "nine million, nine hundred seventy-nine thousand, two hundred forty-two".