18342909 has 16 divisors (see below), whose sum is σ = 29265600. Its totient is φ = 11287728.

The previous prime is 18342899. The next prime is 18342941. The reversal of 18342909 is 90924381.

It is not a de Polignac number, because 18342909 - 2⁴ = 18342893 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18342959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25779 + ... + 26480.

It is an arithmetic number, because the mean of its divisors is an integer number (1829100).

Almost surely, 2^18342909 is an apocalyptic number.

It is an amenable number.

18342909 is a deficient number, since it is larger than the sum of its proper divisors (10922691).

18342909 is a wasteful number, since it uses less digits than its factorization.

18342909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52281 (or 52275 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 18342909 is about 4282.8622438738. The cubic root of 18342909 is about 263.7278962931.

The spelling of 18342909 in words is "eighteen million, three hundred forty-two thousand, nine hundred nine".