9979645 has 8 divisors (see below), whose sum is σ = 12896856. Its totient is φ = 7369536.

The previous prime is 9979643. The next prime is 9979681. The reversal of 9979645 is 5469799.

It can be written as a sum of positive squares in 4 ways, for example, as 12996 + 9966649 = 114^2 + 3157^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9979645 - 2¹ = 9979643 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9979643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76702 + ... + 76831.

It is an arithmetic number, because the mean of its divisors is an integer number (1612107).

Almost surely, 2^9979645 is an apocalyptic number.

It is an amenable number.

9979645 is a deficient number, since it is larger than the sum of its proper divisors (2917211).

9979645 is a wasteful number, since it uses less digits than its factorization.

9979645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153551.

The product of its digits is 612360, while the sum is 49.

The square root of 9979645 is about 3159.0576126434. The cubic root of 9979645 is about 215.2971913151.

The spelling of 9979645 in words is "nine million, nine hundred seventy-nine thousand, six hundred forty-five".