18444207 has 4 divisors (see below), whose sum is σ = 24592280. Its totient is φ = 12296136.

The previous prime is 18444169. The next prime is 18444211. The reversal of 18444207 is 70244481.

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

It is not a de Polignac number, because 18444207 - 2⁸ = 18443951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18444227) 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, 3074032 + ... + 3074037.

It is an arithmetic number, because the mean of its divisors is an integer number (6148070).

Almost surely, 2^18444207 is an apocalyptic number.

18444207 is a deficient number, since it is larger than the sum of its proper divisors (6148073).

18444207 is an equidigital number, since it uses as much as digits as its factorization.

18444207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6148072.

The product of its (nonzero) digits is 7168, while the sum is 30.

The square root of 18444207 is about 4294.6719315915. The cubic root of 18444207 is about 264.2124810273.

Adding to 18444207 its reverse (70244481), we get a palindrome (88688688).

The spelling of 18444207 in words is "eighteen million, four hundred forty-four thousand, two hundred seven".