18266861 has 4 divisors (see below), whose sum is σ = 18299424. Its totient is φ = 18234300.

The previous prime is 18266849. The next prime is 18266867. The reversal of 18266861 is 16866281.

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 18266861 - 2⁶ = 18266797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18266867) 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, 15425 + ... + 16566.

It is an arithmetic number, because the mean of its divisors is an integer number (4574856).

Almost surely, 2^18266861 is an apocalyptic number.

It is an amenable number.

18266861 is a deficient number, since it is larger than the sum of its proper divisors (32563).

18266861 is an equidigital number, since it uses as much as digits as its factorization.

18266861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32562.

The product of its digits is 27648, while the sum is 38.

The square root of 18266861 is about 4273.9748478436. The cubic root of 18266861 is about 263.3629276501.

The spelling of 18266861 in words is "eighteen million, two hundred sixty-six thousand, eight hundred sixty-one".