18061855 has 8 divisors (see below), whose sum is σ = 24770592. Its totient is φ = 12385248.

The previous prime is 18061829. The next prime is 18061859. The reversal of 18061855 is 55816081.

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 18061855 - 2¹³ = 18053663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18061855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18061859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257992 + ... + 258061.

It is an arithmetic number, because the mean of its divisors is an integer number (3096324).

Almost surely, 2^18061855 is an apocalyptic number.

18061855 is a deficient number, since it is larger than the sum of its proper divisors (6708737).

18061855 is an equidigital number, since it uses as much as digits as its factorization.

18061855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516065.

The product of its (nonzero) digits is 9600, while the sum is 34.

The square root of 18061855 is about 4249.9241169696. The cubic root of 18061855 is about 262.3739924325.

The spelling of 18061855 in words is "eighteen million, sixty-one thousand, eight hundred fifty-five".