18002986 has 4 divisors (see below), whose sum is σ = 27004482. Its totient is φ = 9001492.

The previous prime is 18002969. The next prime is 18002989. The reversal of 18002986 is 68920081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68920081 = 103 ⋅669127.

It can be written as a sum of positive squares in only one way, i.e., 16362025 + 1640961 = 4045^2 + 1281^2 .

It is not an unprimeable number, because it can be changed into a prime (18002989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4500745 + ... + 4500748.

Almost surely, 2^18002986 is an apocalyptic number.

18002986 is a deficient number, since it is larger than the sum of its proper divisors (9001496).

18002986 is an equidigital number, since it uses as much as digits as its factorization.

18002986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9001495.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 18002986 is about 4242.9925760010. The cubic root of 18002986 is about 262.0886303489.

The spelling of 18002986 in words is "eighteen million, two thousand, nine hundred eighty-six".