18934385 has 8 divisors (see below), whose sum is σ = 22773120. Its totient is φ = 15112944.

The previous prime is 18934381. The next prime is 18934423. The reversal of 18934385 is 58343981.

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

It is a cyclic number.

It is not a de Polignac number, because 18934385 - 2² = 18934381 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18934381) 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, 1775 + ... + 6404.

It is an arithmetic number, because the mean of its divisors is an integer number (2846640).

Almost surely, 2^18934385 is an apocalyptic number.

It is an amenable number.

18934385 is a deficient number, since it is larger than the sum of its proper divisors (3838735).

18934385 is an equidigital number, since it uses as much as digits as its factorization.

18934385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8647.

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

The square root of 18934385 is about 4351.3658775148. The cubic root of 18934385 is about 266.5326401149.

The spelling of 18934385 in words is "eighteen million, nine hundred thirty-four thousand, three hundred eighty-five".