18266117 has 4 divisors (see below), whose sum is σ = 19060320. Its totient is φ = 17471916.

The previous prime is 18266107. The next prime is 18266119. The reversal of 18266117 is 71166281.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 18266117 - 2⁸ = 18265861 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 (18266119) 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, 397067 + ... + 397112.

It is an arithmetic number, because the mean of its divisors is an integer number (4765080).

Almost surely, 2^18266117 is an apocalyptic number.

It is an amenable number.

18266117 is a deficient number, since it is larger than the sum of its proper divisors (794203).

18266117 is an equidigital number, since it uses as much as digits as its factorization.

18266117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794202.

The product of its digits is 4032, while the sum is 32.

The square root of 18266117 is about 4273.8878085415. The cubic root of 18266117 is about 263.3593520553.

The spelling of 18266117 in words is "eighteen million, two hundred sixty-six thousand, one hundred seventeen".