18227201 has 4 divisors (see below), whose sum is σ = 19019712. Its totient is φ = 17434692.

The previous prime is 18227197. The next prime is 18227203. The reversal of 18227201 is 10272281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10272281 = 1021 ⋅10061.

It is a cyclic number.

It is not a de Polignac number, because 18227201 - 2² = 18227197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 792487 = 18227201 / (1 + 8 + 2 + 2 + 7 + 2 + 0 + 1).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18227203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396221 + ... + 396266.

It is an arithmetic number, because the mean of its divisors is an integer number (4754928).

It is a Proth number, since it is equal to 2225 ⋅ 2¹³ + 1 and 2225 < 2¹³.

Almost surely, 2^18227201 is an apocalyptic number.

It is an amenable number.

18227201 is a deficient number, since it is larger than the sum of its proper divisors (792511).

18227201 is an equidigital number, since it uses as much as digits as its factorization.

18227201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792510.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 18227201 is about 4269.3326176348. The cubic root of 18227201 is about 263.1721898613.

Adding to 18227201 its reverse (10272281), we get a palindrome (28499482).

The spelling of 18227201 in words is "eighteen million, two hundred twenty-seven thousand, two hundred one".