18266137 has 4 divisors (see below), whose sum is σ = 18293796. Its totient is φ = 18238480.

The previous prime is 18266119. The next prime is 18266141. The reversal of 18266137 is 73166281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73166281 = 71 ⋅1030511.

It can be written as a sum of positive squares in 2 ways, for example, as 11485321 + 6780816 = 3389^2 + 2604^2 .

It is a cyclic number.

It is not a de Polignac number, because 18266137 - 2¹⁹ = 17741849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18266107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12814 + ... + 14167.

It is an arithmetic number, because the mean of its divisors is an integer number (4573449).

Almost surely, 2^18266137 is an apocalyptic number.

It is an amenable number.

18266137 is a deficient number, since it is larger than the sum of its proper divisors (27659).

18266137 is an equidigital number, since it uses as much as digits as its factorization.

18266137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27658.

The product of its digits is 12096, while the sum is 34.

The square root of 18266137 is about 4273.8901483309. The cubic root of 18266137 is about 263.3594481748.

The spelling of 18266137 in words is "eighteen million, two hundred sixty-six thousand, one hundred thirty-seven".