99979186 has 4 divisors (see below), whose sum is σ = 149968782. Its totient is φ = 49989592.

The previous prime is 99979181. The next prime is 99979219. The reversal of 99979186 is 68197999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68197999 = 17 ⋅4011647.

It can be written as a sum of positive squares in only one way, i.e., 96648561 + 3330625 = 9831^2 + 1825^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 99979186.

It is not an unprimeable number, because it can be changed into a prime (99979181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24994795 + ... + 24994798.

Almost surely, 2^99979186 is an apocalyptic number.

99979186 is a deficient number, since it is larger than the sum of its proper divisors (49989596).

99979186 is a wasteful number, since it uses less digits than its factorization.

99979186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49989595.

The product of its digits is 2204496, while the sum is 58.

The square root of 99979186 is about 9998.9592458415. The cubic root of 99979186 is about 464.1266777834.

The spelling of 99979186 in words is "ninety-nine million, nine hundred seventy-nine thousand, one hundred eighty-six".