18396609 has 48 divisors (see below), whose sum is σ = 32219136. Its totient is φ = 9223200.

The previous prime is 18396607. The next prime is 18396629. The reversal of 18396609 is 90669381.

It is not a de Polignac number, because 18396609 - 2¹ = 18396607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18396607) 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 47 ways as a sum of consecutive naturals, for example, 49944 + ... + 50310.

It is an arithmetic number, because the mean of its divisors is an integer number (671232).

Almost surely, 2^18396609 is an apocalyptic number.

It is an amenable number.

18396609 is a deficient number, since it is larger than the sum of its proper divisors (13822527).

18396609 is a wasteful number, since it uses less digits than its factorization.

18396609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426 (or 419 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 18396609 is about 4289.1268342170. The cubic root of 18396609 is about 263.9850054615.

It can be divided in two parts, 1839 and 6609, that added together give a palindrome (8448).

The spelling of 18396609 in words is "eighteen million, three hundred ninety-six thousand, six hundred nine".