18126909 has 20 divisors (see below), whose sum is σ = 27955840. Its totient is φ = 11693160.

The previous prime is 18126907. The next prime is 18126923. The reversal of 18126909 is 90962181.

It is not a de Polignac number, because 18126909 - 2¹ = 18126907 is a prime.

It is a super-3 number, since 3×18126909³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18126907) 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 19 ways as a sum of consecutive naturals, for example, 1099 + ... + 6120.

It is an arithmetic number, because the mean of its divisors is an integer number (1397792).

Almost surely, 2^18126909 is an apocalyptic number.

It is an amenable number.

18126909 is a deficient number, since it is larger than the sum of its proper divisors (9828931).

18126909 is an equidigital number, since it uses as much as digits as its factorization.

18126909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7262 (or 7253 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 18126909 is about 4257.5707862583. The cubic root of 18126909 is about 262.6886154611.

The spelling of 18126909 in words is "eighteen million, one hundred twenty-six thousand, nine hundred nine".