18662986 has 4 divisors (see below), whose sum is σ = 27994482. Its totient is φ = 9331492.

The previous prime is 18662983. The next prime is 18662993. The reversal of 18662986 is 68926681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68926681 = 6199 ⋅11119.

It can be written as a sum of positive squares in only one way, i.e., 12567025 + 6095961 = 3545^2 + 2469^2 .

It is not an unprimeable number, because it can be changed into a prime (18662981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4665745 + ... + 4665748.

Almost surely, 2^18662986 is an apocalyptic number.

18662986 is a deficient number, since it is larger than the sum of its proper divisors (9331496).

18662986 is an equidigital number, since it uses as much as digits as its factorization.

18662986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9331495.

The product of its digits is 248832, while the sum is 46.

The square root of 18662986 is about 4320.0678235417. The cubic root of 18662986 is about 265.2530441622.

The spelling of 18662986 in words is "eighteen million, six hundred sixty-two thousand, nine hundred eighty-six".