18373809 has 8 divisors (see below), whose sum is σ = 24518272. Its totient is φ = 12239280.

The previous prime is 18373807. The next prime is 18373829. The reversal of 18373809 is 90837381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18373809 - 2¹ = 18373807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18373801) 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 7 ways as a sum of consecutive naturals, for example, 5544 + ... + 8214.

It is an arithmetic number, because the mean of its divisors is an integer number (3064784).

Almost surely, 2^18373809 is an apocalyptic number.

It is an amenable number.

18373809 is a deficient number, since it is larger than the sum of its proper divisors (6144463).

18373809 is a wasteful number, since it uses less digits than its factorization.

18373809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4967.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 18373809 is about 4286.4681265583. The cubic root of 18373809 is about 263.8759029933.

The spelling of 18373809 in words is "eighteen million, three hundred seventy-three thousand, eight hundred nine".