9979863 has 4 divisors (see below), whose sum is σ = 13306488. Its totient is φ = 6653240.

The previous prime is 9979859. The next prime is 9979877. The reversal of 9979863 is 3689799.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9979863 - 2² = 9979859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9979843) 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 3 ways as a sum of consecutive naturals, for example, 1663308 + ... + 1663313.

It is an arithmetic number, because the mean of its divisors is an integer number (3326622).

Almost surely, 2^9979863 is an apocalyptic number.

9979863 is a deficient number, since it is larger than the sum of its proper divisors (3326625).

9979863 is a wasteful number, since it uses less digits than its factorization.

9979863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3326624.

The product of its digits is 734832, while the sum is 51.

The square root of 9979863 is about 3159.0921164157. The cubic root of 9979863 is about 215.2987589876.

Subtracting from 9979863 its reverse (3689799), we obtain a square (6290064 = 2508²).

The spelling of 9979863 in words is "nine million, nine hundred seventy-nine thousand, eight hundred sixty-three".