9978949 has 16 divisors (see below), whose sum is σ = 11007360. Its totient is φ = 9008640.

The previous prime is 9978919. The next prime is 9978959. The reversal of 9978949 is 9498799.

It is not a de Polignac number, because 9978949 - 2⁷ = 9978821 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9978949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71722 + ... + 71860.

It is an arithmetic number, because the mean of its divisors is an integer number (687960).

Almost surely, 2^9978949 is an apocalyptic number.

It is an amenable number.

9978949 is a deficient number, since it is larger than the sum of its proper divisors (1028411).

9978949 is a wasteful number, since it uses less digits than its factorization.

9978949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300.

The product of its digits is 1469664, while the sum is 55.

The square root of 9978949 is about 3158.9474512882. The cubic root of 9978949 is about 215.2921861161.

The spelling of 9978949 in words is "nine million, nine hundred seventy-eight thousand, nine hundred forty-nine".