18385905 has 8 divisors (see below), whose sum is σ = 29417472. Its totient is φ = 9805808.

The previous prime is 18385889. The next prime is 18385909. The reversal of 18385905 is 50958381.

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 18385905 - 2⁴ = 18385889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18385909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612849 + ... + 612878.

It is an arithmetic number, because the mean of its divisors is an integer number (3677184).

Almost surely, 2^18385905 is an apocalyptic number.

18385905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18385905 is a deficient number, since it is larger than the sum of its proper divisors (11031567).

18385905 is a wasteful number, since it uses less digits than its factorization.

18385905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225735.

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 18385905 is about 4287.8788462362. The cubic root of 18385905 is about 263.9337959566.

The spelling of 18385905 in words is "eighteen million, three hundred eighty-five thousand, nine hundred five".