18394385 has 4 divisors (see below), whose sum is σ = 22073268. Its totient is φ = 14715504.

The previous prime is 18394379. The next prime is 18394403. The reversal of 18394385 is 58349381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13191424 + 5202961 = 3632^2 + 2281^2 .

It is a cyclic number.

It is not a de Polignac number, because 18394385 - 2¹² = 18390289 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1839434 + ... + 1839443.

It is an arithmetic number, because the mean of its divisors is an integer number (5518317).

Almost surely, 2^18394385 is an apocalyptic number.

It is an amenable number.

18394385 is a deficient number, since it is larger than the sum of its proper divisors (3678883).

18394385 is an equidigital number, since it uses as much as digits as its factorization.

18394385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3678882.

The product of its digits is 103680, while the sum is 41.

The square root of 18394385 is about 4288.8675661531. The cubic root of 18394385 is about 263.9743671547.

The spelling of 18394385 in words is "eighteen million, three hundred ninety-four thousand, three hundred eighty-five".