18287026 has 4 divisors (see below), whose sum is σ = 27430542. Its totient is φ = 9143512.

The previous prime is 18287021. The next prime is 18287033. The reversal of 18287026 is 62078281.

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

It can be written as a sum of positive squares in only one way, i.e., 16040025 + 2247001 = 4005^2 + 1499^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18286982 and 18287000.

It is not an unprimeable number, because it can be changed into a prime (18287021) 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, 4571755 + ... + 4571758.

Almost surely, 2^18287026 is an apocalyptic number.

18287026 is a deficient number, since it is larger than the sum of its proper divisors (9143516).

18287026 is an equidigital number, since it uses as much as digits as its factorization.

18287026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9143515.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 18287026 is about 4276.3332423935. Note that the first 3 decimals coincide. The cubic root of 18287026 is about 263.4598018102.

The spelling of 18287026 in words is "eighteen million, two hundred eighty-seven thousand, twenty-six".