99979863 has 4 divisors (see below), whose sum is σ = 133306488. Its totient is φ = 66653240.

The previous prime is 99979819. The next prime is 99979871. The reversal of 99979863 is 36897999.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99979863 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99979797 and 99979806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99979813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16663308 + ... + 16663313.

It is an arithmetic number, because the mean of its divisors is an integer number (33326622).

Almost surely, 2^99979863 is an apocalyptic number.

99979863 is a deficient number, since it is larger than the sum of its proper divisors (33326625).

99979863 is a wasteful number, since it uses less digits than its factorization.

99979863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33326624.

The product of its digits is 6613488, while the sum is 60.

The square root of 99979863 is about 9998.9930993075. The cubic root of 99979863 is about 464.1277253783.

The spelling of 99979863 in words is "ninety-nine million, nine hundred seventy-nine thousand, eight hundred sixty-three".