18203485 has 4 divisors (see below), whose sum is σ = 21844188. Its totient is φ = 14562784.

The previous prime is 18203483. The next prime is 18203513. The reversal of 18203485 is 58430281.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13235044 + 4968441 = 3638^2 + 2229^2 .

It is a cyclic number.

It is not a de Polignac number, because 18203485 - 2¹ = 18203483 is a prime.

It is a super-3 number, since 3×18203485³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18203483) 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 3 ways as a sum of consecutive naturals, for example, 1820344 + ... + 1820353.

It is an arithmetic number, because the mean of its divisors is an integer number (5461047).

Almost surely, 2^18203485 is an apocalyptic number.

It is an amenable number.

18203485 is a deficient number, since it is larger than the sum of its proper divisors (3640703).

18203485 is an equidigital number, since it uses as much as digits as its factorization.

18203485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3640702.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 18203485 is about 4266.5542302894. The cubic root of 18203485 is about 263.0579997091.

The spelling of 18203485 in words is "eighteen million, two hundred three thousand, four hundred eighty-five".