9911979 has 24 divisors (see below), whose sum is σ = 17851392. Its totient is φ = 5148720.

The previous prime is 9911963. The next prime is 9911983. The reversal of 9911979 is 9791199.

It is not a de Polignac number, because 9911979 - 2⁴ = 9911963 is a prime.

It is a nude number because it is divisible by every one of its digits.

9911979 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9911929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6459 + ... + 7844.

It is an arithmetic number, because the mean of its divisors is an integer number (743808).

Almost surely, 2^9911979 is an apocalyptic number.

9911979 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

9911979 is a deficient number, since it is larger than the sum of its proper divisors (7939413).

9911979 is a wasteful number, since it uses less digits than its factorization.

9911979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14327 (or 14324 counting only the distinct ones).

The product of its digits is 45927, while the sum is 45.

The square root of 9911979 is about 3148.3295570826. The cubic root of 9911979 is about 214.8094869045.

It can be divided in two parts, 99 and 11979, that multiplied together give a 4-th power (1185921 = 33⁴).

The spelling of 9911979 in words is "nine million, nine hundred eleven thousand, nine hundred seventy-nine".