18085478 has 4 divisors (see below), whose sum is σ = 27128220. Its totient is φ = 9042738.

The previous prime is 18085477. The next prime is 18085481. The reversal of 18085478 is 87458081.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18085477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4521368 + ... + 4521371.

It is an arithmetic number, because the mean of its divisors is an integer number (6782055).

Almost surely, 2^18085478 is an apocalyptic number.

18085478 is a deficient number, since it is larger than the sum of its proper divisors (9042742).

18085478 is an equidigital number, since it uses as much as digits as its factorization.

18085478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9042741.

The product of its (nonzero) digits is 71680, while the sum is 41.

The square root of 18085478 is about 4252.7024349230. The cubic root of 18085478 is about 262.4883284304.

It can be divided in two parts, 180 and 85478, that added together give a palindrome (85658).

The spelling of 18085478 in words is "eighteen million, eighty-five thousand, four hundred seventy-eight".