18445385 has 16 divisors (see below), whose sum is σ = 25837056. Its totient is φ = 12378048.

The previous prime is 18445381. The next prime is 18445393. The reversal of 18445385 is 58354481.

It is a cyclic number.

It is not a de Polignac number, because 18445385 - 2² = 18445381 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18445381) 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 15 ways as a sum of consecutive naturals, for example, 3962 + ... + 7251.

It is an arithmetic number, because the mean of its divisors is an integer number (1614816).

Almost surely, 2^18445385 is an apocalyptic number.

It is an amenable number.

18445385 is a deficient number, since it is larger than the sum of its proper divisors (7391671).

18445385 is a wasteful number, since it uses less digits than its factorization.

18445385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11272.

The product of its digits is 76800, while the sum is 38.

The square root of 18445385 is about 4294.8090760824. The cubic root of 18445385 is about 264.2181058409.

The spelling of 18445385 in words is "eighteen million, four hundred forty-five thousand, three hundred eighty-five".