18385416 has 48 divisors (see below), whose sum is σ = 56908800. Its totient is φ = 5252832.

The previous prime is 18385399. The next prime is 18385417. The reversal of 18385416 is 61458381.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18385417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17736 + ... + 18743.

It is an arithmetic number, because the mean of its divisors is an integer number (1185600).

Almost surely, 2^18385416 is an apocalyptic number.

It is an amenable number.

18385416 is an abundant number, since it is smaller than the sum of its proper divisors (38523384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18385416 is a wasteful number, since it uses less digits than its factorization.

18385416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36498 (or 36491 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 18385416 is about 4287.8218246564. The cubic root of 18385416 is about 263.9314560342.

The spelling of 18385416 in words is "eighteen million, three hundred eighty-five thousand, four hundred sixteen".