18385550 has 12 divisors (see below), whose sum is σ = 34197216. Its totient is φ = 7354200.

The previous prime is 18385547. The next prime is 18385607. The reversal of 18385550 is 5558381.

It is a self number, because there is not a number n which added to its sum of digits gives 18385550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 183806 + ... + 183905.

It is an arithmetic number, because the mean of its divisors is an integer number (2849768).

Almost surely, 2^18385550 is an apocalyptic number.

18385550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18385550 is a deficient number, since it is larger than the sum of its proper divisors (15811666).

18385550 is a wasteful number, since it uses less digits than its factorization.

18385550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367723 (or 367718 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 35.

The square root of 18385550 is about 4287.8374502772. The cubic root of 18385550 is about 263.9320972441.

The spelling of 18385550 in words is "eighteen million, three hundred eighty-five thousand, five hundred fifty".