18027206 has 4 divisors (see below), whose sum is σ = 27040812. Its totient is φ = 9013602.

The previous prime is 18027203. The next prime is 18027209. The reversal of 18027206 is 60272081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60272081 = 2389 ⋅25229.

It is an interprime number because it is at equal distance from previous prime (18027203) and next prime (18027209).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18027203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4506800 + ... + 4506803.

It is an arithmetic number, because the mean of its divisors is an integer number (6760203).

Almost surely, 2^18027206 is an apocalyptic number.

18027206 is the 2270-th centered heptagonal number.

18027206 is a deficient number, since it is larger than the sum of its proper divisors (9013606).

18027206 is an equidigital number, since it uses as much as digits as its factorization.

18027206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9013605.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 18027206 is about 4245.8457343620. The cubic root of 18027206 is about 262.2061097886.

Adding to 18027206 its reverse (60272081), we get a palindrome (78299287).

The spelling of 18027206 in words is "eighteen million, twenty-seven thousand, two hundred six".