18266971 has 4 divisors (see below), whose sum is σ = 18309592. Its totient is φ = 18224352.

The previous prime is 18266957. The next prime is 18266981. The reversal of 18266971 is 17966281.

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

It is a cyclic number.

It is not a de Polignac number, because 18266971 - 2⁵ = 18266939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18266981) 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, 20661 + ... + 21526.

It is an arithmetic number, because the mean of its divisors is an integer number (4577398).

Almost surely, 2^18266971 is an apocalyptic number.

18266971 is a deficient number, since it is larger than the sum of its proper divisors (42621).

18266971 is an equidigital number, since it uses as much as digits as its factorization.

18266971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42620.

The product of its digits is 36288, while the sum is 40.

The square root of 18266971 is about 4273.9877164072. The cubic root of 18266971 is about 263.3634562917.

The spelling of 18266971 in words is "eighteen million, two hundred sixty-six thousand, nine hundred seventy-one".