99972986 has 4 divisors (see below), whose sum is σ = 149959482. Its totient is φ = 49986492.

The previous prime is 99972967. The next prime is 99972991. The reversal of 99972986 is 68927999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68927999 = 7 ⋅9846857.

It can be written as a sum of positive squares in only one way, i.e., 89208025 + 10764961 = 9445^2 + 3281^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24993245 + ... + 24993248.

Almost surely, 2^99972986 is an apocalyptic number.

99972986 is a deficient number, since it is larger than the sum of its proper divisors (49986496).

99972986 is a wasteful number, since it uses less digits than its factorization.

99972986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49986495.

The product of its digits is 4408992, while the sum is 59.

The square root of 99972986 is about 9998.6492087682. The cubic root of 99972986 is about 464.1170836369.

The spelling of 99972986 in words is "ninety-nine million, nine hundred seventy-two thousand, nine hundred eighty-six".